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Massive Basalt Flows on the Southern Flank of Tamu Massif, Shatsky Rise: a Reappraisal of ODP Site 1213 Basement Units1 A.A.P
Sager, W.W., Sano, T., Geldmacher, J., and the Expedition 324 Scientists Proceedings of the Integrated Ocean Drilling Program, Volume 324 Massive basalt flows on the southern flank of Tamu Massif, Shatsky Rise: a reappraisal of ODP Site 1213 basement units1 A.A.P. Koppers,2 T. Sano, 3 J.H. Natland,3 M. Widdowson,3 R. Almeev,3 A.R. Greene,3 D.T. Murphy,3 A. Delacour,3 M. Miyoshi,3 K. Shimizu,3 S. Li,3 N. Hirano,3 J. Geldmacher,3 and the Expedition 324 Scientists3 Chapter contents Abstract Abstract . 1 Drilling during Ocean Drilling Program Leg 198 at Site 1213 re- covered three massive basalt units (8–15 m thick) from the south- Introduction . 1 ern flank of Tamu Massif at Shatsky Rise. Originally, these igneous Volcanology and igneous petrology of Site 1213. 2 units were interpreted to represent three diabase sills. During In- Interpretation and conclusions. 5 tegrated Ocean Drilling Program Expedition 324, this core was re- Acknowledgments. 6 described leading to the new conclusion that these diabase units References . 6 represent three submarine massive basalt flows. These massive Figures . 8 submarine flows were probably emplaced as inflated compound Table . 20 sheet flows during eruptions similar to those in large oceanic pla- teaus and continental flood basalts. Introduction The main objective of Integrated Ocean Drilling Program (IODP) Expedition 324 was to test competing mantle plume and plate tectonic models for ocean plateau formation at Shatsky Rise (Fig. F1). In these tests, determining the timing, duration, and source of volcanism at Shatsky Rise is of pivotal importance to under- stand the origin of this oceanic plateau. -
Scientists Confirm Existence of Largest Single Volcano on Earth (Update) 5 September 2013
Scientists confirm existence of largest single volcano on Earth (Update) 5 September 2013 Tamu Massif did indeed erupt from a single source near the center. "Tamu Massif is the biggest single shield volcano ever discovered on Earth," Sager said. "There may be larger volcanoes, because there are bigger igneous features out there such as the Ontong Java Plateau, but we don't know if these features are one volcano or complexes of volcanoes." MCS re?ection Line A–B, across the axis of Tamu Massif. Credit: Nature A University of Houston (UH) professor led a team of scientists to uncover the largest single volcano yet documented on Earth. Covering an area roughly equivalent to the British Isles or the state of New Mexico, this volcano, dubbed the Tamu Massif, is nearly as big as the giant volcanoes of Mars, placing it among the largest in the Solar System. William Sager, a professor in the Department of Earth and Atmospheric Sciences at UH, first began studying the volcano about 20 years ago at Texas A&M's College of Geosciences. Sager and his team's findings appear in the Sept. 8 issue of Nature Geoscience, the monthly multi-disciplinary journal reflecting disciplines within the geosciences. Located about 1,000 miles east of Japan, Tamu Massif is the largest feature of Shatsky Rise, an underwater mountain range formed 130 to 145 million years ago by the eruption of several underwater volcanoes. Until now, it was unclear whether Tamu Massif was a single volcano, or a IODP technician Margaret Hastedt labels pieces of core composite of many eruption points. -
Important Bird Areas in Hawaii Elepaio Article
Globally Important Bird Areas in the Hawaiian Islands: Final Report Dr. Eric A. VanderWerf Pacific Rim Conservation 3038 Oahu Avenue Honolulu, HI 96822 9 June 2008 Prepared for the National Audubon Society, Important Bird Areas Program, Audubon Science, 545 Almshouse Road, Ivyland, PA 18974 3 of the 17 globally Important Bird Areas in Hawai`i, from top to bottom: Lehua Islet Hanawī Natural Area Reserve, Maui Hanalei National Wildlife Refuge, Kauai All photos © Eric VanderWerf Hawaii IBAs VanderWerf - 2 INTRODUCTION TO THE IMPORTANT BIRD AREAS PROGRAM The Important Bird Areas (IBA) Program is a global effort developed by BirdLife International, a global coalition of partner organizations in more than 100 countries, to assist with identification and conservation of areas that are vital to birds and other biodiversity. The IBA Program was initiated by BirdLife International in Europe in the 1980's. Since then, over 8,000 sites in 178 countries have been identified as Important Bird Areas, with many national and regional IBA inventories published in 19 languages. Hundreds of these sites and millions of acres have received better protection as a result of the IBA Program. As the United States Partner of BirdLife International, the National Audubon Society administers the IBA Program in the U.S., which was launched in 1995 (see http://www.audubon.org/bird/iba/index.html). Forty-eight states have initiated IBA programs, and more than 2,100 state-level IBAs encompassing over 220 million acres have been identified across the country. Information about these sites will be reviewed by the U.S. IBA Committee to confirm whether they qualify for classification as sites of continental or global significance. -
Nihoa Manawai Holoikauaua Pearl & Hermes Atoll Kapou Papa'āpoho Lisianski Island Kamole Kauō Laysan Island Kamokuokamohoali'i Ko'anako'a Maro Reef
175°E 180° 175°W 170°W 165°W 160°W 155°W 150°W 35°N 35°N North America Japan Map Area Photo by Dan Clark/USFWS Hawaiian Islands Photo by Na‘alehu Anthony P a c i f i c Seabird Refuge A Living Hawaiian Culture O c e a n The monument is home to over 14 million seabirds 30°N Hiryū USS Yorktown Equator representing 23 species. This includes the world's Traditional Hawaiian accounts describe largest colonies of Laysan and black-footed Papahānaumokuākea as a sacred area from which Rapa Sōryū albatross. Pictured above is the world's oldest life first emerged and to which spirits return after Nui Australia known bird in the wild – a Laysan albatross named 30°N death. Akagi Wisdom! Banded in 1956 when she was at least five Kaga years old, Wisdom may have hatched more than 36 New Zealand chicks in her lifetime. Hōlanikū Manawai Unnamed Holoikauaua Mokupāpapa Seamount Kure Atoll Pearl & Hermes Atoll 582,578 square miles, only six square miles of land Helsley Seamount Ladd Seamount Kamole Kauō ‘Ōnūnui, ‘Ōnūiki Photo by Mark Sullivan/NOAA Laysan Island Photo by NOAA/OER Endemic Sanctuary Pūhāhonu New Discoveries The monument is home to many species found Kuaihelani Gardner Pinnacles The majority of the seafloor in the Northwestern nowhere else on Earth and is a critically important Pihemanu Salmon Hawaiian Islands lies at depths below 10,000 feet nesting ground for green sea turtles and breeding Bank (3,000 meters). Using advanced technologies like ground for Hawaiian monk seals. -
(2020) Pūhāhonu: Earth's Biggest and Hottest Shield Volcano. Earth And
Earth and Planetary Science Letters 542 (2020) 116296 Contents lists available at ScienceDirect Earth and Planetary Science Letters www.elsevier.com/locate/epsl Puh¯ ahonu:¯ Earth’s biggest and hottest shield volcano ∗ Michael O. Garcia a, , Jonathan P. Tree a, Paul Wessel a, John R. Smith b a Department of Earth Sciences, University of Hawai‘i at Manoa,¯ Honolulu, HI 96822, USA b Department of Oceanography, University of Hawai‘i at Manoa,¯ Honolulu, HI 96822, USA a r t i c l e i n f o a b s t r a c t Article history: New bathymetric and gravity mapping, refined volume calculations and petrologic analyses show that Received 22 November 2019 the Hawaiian volcano Puh¯ ahonu¯ is the largest and hottest shield volcano on Earth. This ∼12.5-14.1 Ma Received in revised form 5 April 2020 volcano in the northwest Hawaiian Ridge (NWHR) is twice the size of Mauna Loa volcano (148 ± 29 vs. Accepted 18 April 2020 3 3 74.0 × 10 km ), which was assumed to be not only the largest Hawaiian volcano but also the largest Available online xxxx known shield volcano. We considered four testable mechanisms to increase magma production, including Editor: R. Dasgupta 1) thinner lithosphere, 2) slower propagation rate, 3) more fertile source, and 4) hotter mantle. The first Keywords: three of these have been ruled out. The lithosphere was old (∼88 Myrs) when Puh¯ ahonu¯ was formed, Hawaii and thus, too thick and cold to allow for greater extents of partial melting. The propagation rate was volume relatively fast when it erupted (87 km/Myr), so this is another unlikely reason. -
Geochemistry and Age of Shatsky, Hess, and Ojin Rise Seamounts: Implications for a Connection Between the Shatsky and Hess Rises
Accepted Manuscript Geochemistry and Age of Shatsky, Hess, and Ojin Rise seamounts: Implications for a connection between the Shatsky and Hess Rises Maria Luisa G. Tejada, Jörg Geldmacher, Folkmar Hauff, Daniel Heaton, Anthony A.P. Koppers, Dieter Garbe-Schönberg, Kaj Hoernle, Ken Heydolph, William W. Sager PII: S0016-7037(16)30165-X DOI: http://dx.doi.org/10.1016/j.gca.2016.04.006 Reference: GCA 9701 To appear in: Geochimica et Cosmochimica Acta Received Date: 4 September 2015 Accepted Date: 1 April 2016 Please cite this article as: Tejada, M.L.G., Geldmacher, J., Hauff, F., Heaton, D., Koppers, A.A.P., Garbe- Schönberg, D., Hoernle, K., Heydolph, K., Sager, W.W., Geochemistry and Age of Shatsky, Hess, and Ojin Rise seamounts: Implications for a connection between the Shatsky and Hess Rises, Geochimica et Cosmochimica Acta (2016), doi: http://dx.doi.org/10.1016/j.gca.2016.04.006 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 Geochemistry and Age of Shatsky, Hess, and Ojin Rise seamounts: Implications 2 for a connection between the Shatsky and Hess Rises 3 Maria Luisa G. Tejada a,b*, Jörg Geldmacher c, Folkmar Hauff c, Daniel Heaton d, Anthony A. -
Pacific-Panthalassic Reconstructions
RESEARCH ARTICLE Pacific‐Panthalassic Reconstructions: Overview, Errata 10.1029/2019GC008402 and the Way Forward Key Points: Trond H. Torsvik1,2 , Bernhard Steinberger3,1 , Grace E. Shephard1 , • We devised a new absolute Late 1 1 1 1 Jurassic‐Cretaceous Pacific plate Pavel V. Doubrovine , Carmen Gaina , Mathew Domeier , Clinton P. Conrad , model and William W. Sager4 • This study was motivated because published Pacific plate models 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway, 2School of Geosciences, University – fl (83.5 150 Ma) are variably awed of Witwatersrand, Johannesburg, South Africa, 3Helmholtz Centre Potsdam, GFZ, Potsdam, Germany, 4Department of • The emplacement of the Shatsky Rise Large Igneous Province at ~144 Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA Ma caused a major plate boundary reorganization Abstract We have devised a new absolute Late Jurassic‐Cretaceous Pacific plate model using a fixed hot spot approach coupled with paleomagnetic data from Pacific large igneous provinces (LIPs) while simultaneously minimizing plate velocity and net lithosphere rotation (NR). This study was motivated Correspondence to: fi ‐ ‐ fl T. H. Torsvik, because published Paci c plate models for the 83.5 to 150 Ma time interval are variably awed, and their [email protected] use affects modeling of the entire Pacific‐Panthalassic Ocean and interpretation of its margin evolution. These flaws could be corrected, but the revised models would imply unrealistically high plate velocities fi Citation: and NR. We have developed three new Paci c realm models with varying degrees of complexity, but we Torsvik, T. H., Steinberger, B., focus on the one that we consider most realistic. -
Inventory and Monitoring of Seabirds in National Park of American Samoa
Final Report. Technical Report 136 INVENTORY AND MONITORING OF SEABIRDS IN NATIONAL PARK OF AMERICAN SAMOA By Paul J. O’Connor and Mark J. Rauzon October 2004 UNIVERSITY OF HAWAI’I AT MANOA NATIONAL PARK SERVICE CONTRACT NO. 8036-2-9004 CONTRIBUTION NUMBER 136 PSCU/UH - i - Item Page Table of Contents i List of Figures iii List of Tables iv Report Summary 1 Project Introduction 3 Background 3 Study Area 4 Study Species 11 Methods 13 General Methods 13 Complete Island Surveys 15 Fixed Location Counts 17 High-Elevation Ground & 19 Cliff Nesters Results & Discussion 22 General Results & Discussion 22 Complete Island Surveys 22 Fixed location Counts 35 Seabird Colonies 38 Coastal Breeders 38 High-Elevation Ground & Cliff 40 Nesters Species Present 40 Nests 43 Petrel Distributions Elsewhere 44 in American Samoa Petrel Specimens & Natural 45 History Rose Atoll Seabirds 49 Conclusions 50 Monitoring & Its Future at 50 NPSA Seabird Population Status 52 Field Access & Operations 54 Developing Additional 55 Survey Methods Invasive Species 56 - ii - Invertebrates 56 Vertebrates 56 Rodent Control 60 Human Impacts 63 Recommendations 64 Tutuila Unit 64 Manu’a Units 65 Acknowledgments 66 References 67 Appendices 71-140 Appendix A: Seabird Accounts for American Samoa 71 Appendix B: Tutuila and Aunu’u Islands, Round Island 98 Survey Site Maps Appendix C: Tahiti Petrel Voice Analysis 112 Appendix D: Ectoparasites from Tahiti Petrel on Ta’u 116 Appendix E: Radar Survey Techniques Employed at 119 Channel Islands National Park Appendix F: Establishing a Water Collection System 123 and Base Camp on Mt. Lata Appendix G: Status of the Spotless Crake in American 124 Samoa Appendix H: Coastal Seabird Colonies Maps for 130 American Samoa Appendix I: Brief Video Clips from Summit of Mt. -
Identification of the Property Papahänaumokuäkea Marine National Monument
1. DRAFT 38 3. Justification for Inscription Identification of the Property Papahänaumokuäkea Marine National Monument 1. Identification of the Property (Photo: James Watt) 1.a Country United States of America. 1.b State, Province or Region apahänaumokuäkea Marine National Monument is comprised of lands and Popular and Historic Names waters under the management, control and jurisdiction of the United States of America, Table1.1: Other popular or historic place and also includes lands and waters of the names for the property State of Hawai‘i. P The Northwestern Hawaiian Islands (NWHI) The Küpuna (Elder) Islands 1.c Name of Property The Leeward Islands “Papahänaumokuäkea Marine Nä Moku Manamana National Monument” Nä Moku Papapa Papahänaumokuäkea (pronounced Throughout this document, several Pa-pa HAH-nou-mo-koo-AH-keh-ah) comes placenames are used. In general, from an ancient Hawaiian traditional chant “Papahänaumokuäkea” sufficiently concerning the genealogy and formation of refers to the place, although the terms the Hawaiian Islands, and a deep honoring “Northwestern Hawaiian Islands” or of the dualisms of life. An explanation of the “NWHI” are used when referencing 10 meaning and process for naming the property biogeography or when quoting publications is found at the beginning of Section 2.a. employing these placenames. When referring to management authorities and the like, this document applies the term PopularNames of and Individual Historic Islands/Reefs/Shoals names “the Monument”. Table 1.2: Names of individual islands, reefs, -
Native Plants of Midway Atoll NWR U.S
Native Plants of Midway Atoll NWR U.S. Fish and Wildlife Service Report by John Klavitter, Honolulu, HI, December 22, 2006. In the past, at least 37 native plant species have occurred at Midway. Currently, 20 native species (6 endemic, 1 species of concern) occur on the Refuge and at least 15 (9 endemic) have been extirpated and 2 (both endemic) are thought to be extinct. Lepterus repens (ind) Psuedognaphalium sandwicensium Lepterus (nwm), Wagner et al. 1999 ‘Ena’ena (end, nwm) One endemic palm from Molokai is also present, but not included in Midway’s native plant species count. The total number of species (native and non-native) recorded from Midway is 354 with a total of 264 being present during the last major botanical survey between April and June 1999 (Starr and Martz 1999). The Refuge hopes to reintroduce Achyranthes atollensis (end) appropriate extirpated plants back to Lepidium bidentatum var. o-wahihiense (end) Note: A. splendens shown above Midway within the next 2 years and 'Anaunau (nw) (rei from Laysan 2005) (E, nw, ext), Wagner et al. 1999 proposes using seeds to avoid accidental alien species introductions. (end = endemic to Hawaii, ind = indigenous to Hawaii, nw = found in Northwestern Hawaiian Islands only, nwm = found in the Northwestern and Main Hawaiian Islands, E = endangered, T = threatened, C = species of concern, ext = extinct, exr = extirpated at Midway, rei = extirpated at Midway but reintroduced, red = Mariscus javanicus (ind) ‘Ahu’ahu, Eragrostis variabilis (end) Bunch Grass, rediscovered at Midway). Wagner et al. 1999 (nwm) Kawelu, Emoloa Lovegrass (nwm) Eragrostis paupera (ind) Dwarf Bunch Grass (nwm) Cenchrus agrimonioides var. -
EGU2018-5700, 2018 EGU General Assembly 2018 © Author(S) 2018
Geophysical Research Abstracts Vol. 20, EGU2018-5700, 2018 EGU General Assembly 2018 © Author(s) 2018. CC Attribution 4.0 license. Numerical modeling for the geodynamic formation of the Tamu Massif, the largest single volcano on Earth Jinchang Zhang (1), Min Ding (2), and Zhiyuan Zhou (1) (1) CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China ([email protected]), (2) School of Earth and Space Sciences, Peking University, Beijing, China The Western Pacific Ocean has most of the underwater volcanoes on Earth, and among them the Tamu Massif within the Shatsky Rise is proved to be the largest single volcano. By comparing thermo-mechanical models with gravity, topography, and seismic observations, we seek to address an important question: “How did this Earth’s largest volcano form by the interaction between a ridge-ridge-ridge triple junction and a mantle plume?” We focus on the following tasks: 1.set up three-dimensional thermo-mechanical models to simulate the ridge-plume interac- tion; 2.calculate the coupled mantle flow and temperature structure, and constrain the model parameters (spreading rates, plume size and depth, loading time, magma types, melting conditions, source temperature) using magnetic anomalies and magmatic geochemistry characteristics; 3.compute model-based magma supply and compare with crustal thickness and crustal volume estimates from seismic sounding and gravity observations; 4.invert for model parameters and find the control parameters on the volcano’s formation. It is creative to conduct a quantitative anal- ysis of the volcano’s formation, which can provide insights to the geodynamic evolution of thick oceanic crust. -
Structural and Morphologic Study of Shatsky Rise Oceanic
STRUCTURAL AND MORPHOLOGIC STUDY OF SHATSKY RISE OCEANIC PLATEAU IN THE NORTHWEST PACIFIC OCEAN FROM 2D MULTICHANNEL SEISMIC REFLECTION AND BATHYMETRY DATA AND IMPLICATIONS FOR OCEANIC PLATEAU EVOLUTION A Dissertation by JINCHANG ZHANG Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Chair of Committee, William W. Sager Co-Chair of Committee, Zuosheng Yang Committee Members, Mitch W. Lyle Richard L. Gibson Head of Department, Debbie J. Thomas May 2014 Major Subject: Oceanography Copyright 2014 Jinchang Zhang ABSTRACT Shatsky Rise is one of the largest oceanic plateaus, a class of volcanic features whose formation is poorly understood. It is also a plateau that was formed near spreading ridges, but the connection is unclear. The geologic structure and morphology of Shatsky Rise oceanic plateau provides key observations that can help understand its formation. Deep penetrating 2D multichannel seismic (MCS) reflection profiles and high-resolution multi-beam sonar data were acquired over the southern half of Shatsky Rise on R/V Marcus G. Langseth during two cruises. The MCS profiles allow us to image Shatsky Rise's upper crustal structure and Moho structure with unprecedented detail, and the multi-beam bathymetry data allow us to produce an improved bathymetric map of the plateau. MCS profiles and bathymetry data show that two of the volcanic massifs within Shatsky Rise are immense central volcanoes. Tamu Massif, the largest (~450 × 650 km) and oldest (~145 Ma) volcano, is a single central volcano with rounded shape and shallow flank slopes (<0.5o-1.5o), characterized by lava flows emanating from the volcano center and extending hundreds of kilometers down smooth, shallow flanks to the surrounding seafloor.