3. Background and Regional Setting1

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3. Background and Regional Setting1 Taylor, B., Huchon, P., Klaus, A., et al., 1999 Proceedings of the Ocean Drilling Program, Initial Reports Volume 180 3. BACKGROUND AND REGIONAL SETTING1 Brian Taylor2 THEMATIC INTRODUCTION The processes by which continental lithosphere accommodates strain during rifting and the initiation of seafloor spreading are pres- ently known primarily from the study of either (1) passive margins bor- dering rifted continents where extensional tectonics have long ceased and evidence for active tectonic processes must be reconstructed from a record that is deeply buried in post-rift sediments and thermally equili- brated or (2) regions of intracontinental extension, such as East Africa, the U.S. Basin and Range, and the Aegean, where extension has occurred recently by comparison to most passive margin examples, but has not proceeded to the point of continental breakup. One particularly controversial conjecture from these studies is that the larger normal detachment faults dip at low angles and accommo- date very large amounts of strain through simple shear of the entire lithosphere. The role of low-angle normal detachment faults has been contested strongly, both on observational and theoretical grounds. It has been suggested that intracontinental detachments have been misin- terpreted and actually formed by rollover of originally high-angle fea- tures, or that they occur at the brittle/ductile boundary in a pure shear system. Theoretically, it has been shown that normal faulting on detachment surfaces would require that the fault be extremely weak— almost frictionless—to allow horizontal stresses to cause failure on low- angle planes. The growing evidence for a weak fault and strong crust associated with motion on the San Andreas transform fault supports the 1Examples of how to reference the weak normal detachment fault model, and models in which low-angle whole or part of this volume. 2School of Ocean and Earth Science detachment faulting is an essential mechanism of large-scale strain and Technology, University of Hawaii accommodation abound in the literature. at Manoa, 2525 Correa Road, Nevertheless, the mechanisms by which friction might be effectively Honolulu, HI 96822-2285, U.S.A. reduced on low-angle normal fault surfaces are not understood. One [email protected] possibility is that active shearing in the fault zone creates a strong per- Ms 180IR-103 B. TAYLOR CHAPTER 3, BACKGROUND AND REGIONAL SETTING 2 meability contrast with the surrounding crust (by opening cracks more quickly than precipitation can heal them), allowing pore-pressure dis- tributions that are high and near to the fault-normal compressive stress within the fault zone, but decrease with distance into the adjacent crust (Rice, 1992; Axen, 1992). Others have suggested that fluid-rock reac- tions form phyllosilicates in the fault zone that are particularly weak because of their well-developed fabrics (Wintsch et al., 1995). Alterna- tively, principal-stress orientations may be rotated into configurations consistent with low-angle faulting, although it has not been demon- strated that the magnitudes of reoriented stresses are sufficient to ini- tiate and promote such slip (Wills and Buck, 1997). Testing for such fault-proximal high permeability and pore pressures, for the presence of weak phyllosilicates, and/or for local rotation of stress axes, requires drilling into an active system. This would also allow determination of the properties of the fault rock at depth (do they exhibit reduced fric- tional strength at higher slip velocities, consistent with unstable sliding and observed earthquakes?), as well as studies of the mechanisms by which fluid-rock reactions affect deformation (constitutive response, frictional stability, long-term fault strength; see Hickman et al., 1993, and Barton et al., 1995, for extensive discussion of the mechanical involvement of fluids in faulting, and Wernicke, 1995, for a review of low-angle normal faulting). A primary objective of Leg 180 was to drill into and characterize an active low-angle normal fault—the extreme example of the low-stress fault paradox. Such a fault, dipping 25°–30°, has been imaged north of Moresby Seamount where seafloor spreading in the western Woodlark Basin is breaking into the continental lithosphere of Papua New Guinea (see Fig. F1; also “Introduction,” p. 1, in the “Leg 180 Summary” chap- F1. Physiographic features and ter). plate boundaries of the Woodlark The western Woodlark Basin is arguably the best characterized region Basin region, p. 13. 148˚E 150˚E 152˚E 154˚E 156˚E 158˚E 160˚E of active continental breakup. The proximity of a seismogenic low- 6˚S 6˚S SOLOMON ISLANDS SOLOMON SEA angle normal fault that has been imaged by seismic reflection data and NEW GEORGIA GROUP TROBRIAND TROUGH 8˚S 8˚S L TR WOODLARK zero-offset conjugate margins that are about to be penetrated by sea- PAPUAN PENINSULA N-1 ST G-1 RISE W G E F MS floor spreading is unique. This region affords the possibility to defini- GB 10˚S N MT 10˚S MH MB M PAPUAN tively tie together the sedimentology, magmatism, and structures of R RISE PLATEAU POCKLINGTON T LOUISIADE PLATEAU POCKLINGTON TROUGH 12˚S Spreading Center 12˚S FZ, Transform, Pseudofault CORAL SEA (incipient) conjugate margins before they are separated and buried by a Subduction Zone -9 -6 -4 -3 -2 -1 0 1 2 3.5 Continent/Ocean Boundary Bathymetry and Topography (km) subsequent history of seafloor spreading and sedimentation. Determin- 148˚E 150˚E 152˚E 154˚E 156˚E 158˚E 160˚E ing these parameters was a second objective of Leg 180 with the intent to use them as local ground truth to be input into regional models for the timing and amount of extension prior to spreading initiation. A precruise description of the region is provided below. REGIONAL SETTING Research Programs in the Woodlark Basin and Papuan Peninsula Several research programs in the last decade have significantly improved our understanding of the regional geological and geophysical setting of rifting into the Papuan Peninsula: 1. Sidescan and underway geophysical surveys have provided bathymetry, acoustic imagery, magnetization, and gravity maps, and allowed detailed reconstructions of the spreading history (Taylor et al., 1995, 1996, in press; Goodliffe et al., 1997; “Geo- B. TAYLOR CHAPTER 3, BACKGROUND AND REGIONAL SETTING 3 physical Data and Processing,” p. 2, in the “Data Report: Ma- rine Geophysical Surveys of the Woodlark Basin Region” chapter; Goodliffe, 1998). 2. Multichannel seismic reflection surveys reveal the upper crustal architecture of the rifting region, including the presence of low- angle normal faults (see Fig. F4, p. 35, in the “Leg 180 Summary” chapter; Mutter et al., 1996; Taylor et al., 1996, in press; Abers et al., 1997; “Morphology and Seismicity,” p. 4, in the “Data Re- port: Marine Geophysical Surveys of the Woodlark Basin Region” chapter). 3. The PACLARK and SUPACLARK series of cruises in 1986–1991 (Binns et al., 1987, 1989, 1990; Lisitsin et al., 1991; Benes et al., 1994) included dredging, coring, camera and video observa- tions, and seven Mir submersible dives. The bottom samples in- clude Normal Mid-Ocean Ridge Basalt (N-MORB) from the youngest spreading segments, as well as greenschist facies meta- morphics from the lower north flank of Moresby Seamount. In contrast, a 1995 site survey dredged late Pliocene (synrift) sedi- mentary rocks from the upper south flank of Moresby Seamount (Taylor et al., 1996). Their presence is not compatible with exhu- mation of lower crust in the Pliocene–Pleistocene to form Moresby Seamount as a synrift metamorphic core complex. 4. Abers (1991) and Abers et al. (1997) determined source parame- ters and relocated earthquakes in the rifting region. The focal mechanisms are all extensional or strike slip with northerly ten- sion axes (see Fig. F2, p. 33, in the “Leg 180 Summary” chapter). Several are consistent with slip on shallow-dipping normal faults. 5. Studies of metamorphic core complexes on the Papuan Peninsula and D’Entrecasteaux and Misima Islands show that (a) they are as- sociated with Pliocene–Pleistocene granodiorite intrusions and amphibolite-facies ductile shear zones; (b) some have been rapidly exhumed from ~30 km depth (7–11 kilobar [kb]) in the last 4 m.y., whereas others were uplifted to near the surface by the early Mi- ocene; (c) uplift continues (forming topography up to 2.5 km); and (d) they are very three dimensional and regionally discontin- uous (or varying in grade) along strike (Davies and Warren, 1988, 1992; Hill, 1987, 1990, 1994, 1995; Hill et al., 1992, 1995; Hill and Baldwin, 1993; Baldwin et al., 1993; Lister and Baldwin, 1993; Baldwin and Ireland, 1995). 6. The Papuan Ultramafic Belt is a late Paleocene to early Eocene suprasubduction zone ophiolite with gabbros and boninites 40Ar/39Ar dated at 59 Ma (R. Duncan, pers. comm., 1993; Walker and McDougall, 1982), P4 (late Paleocene) foraminifer-bearing micrites overlying the basalts, with tonalite-diorite-dacite intru- sions K/Ar dated at 57–47 Ma (Rogerson et al., 1993). This revi- sion to dating of the Papuan Peninsula basement (Fig. F2) allows F2. Regional geology of eastern a simplified geological evolution for the region, as outlined be- Papua, p. 14. 145° 146° 147° 148° 149° 150° 151° 152° low. 6° 7° Papuan Crustal Evolution 8° OWEN Trobriand Is. Lusancay Is. STANLEY Cape Killerton Paleogene Subduction and Collision 9° E Regional Geology RANGE I2B 1 Paleocene ultramafics 2 and 3 Paleocene gabbro and basalt 4A and 4B Jurassic and/or Cretaceous metasediment S CAPE and metabasalt D VOGEL 5A and 5B Cretaceous-Eocene sediment, metasediment and basalt 12B GOODENOUGH 10° 12A BAY 6 Eocene tonalite 7A and 7B Eocene sediments and volcanics 8 Eocene and Oligocene ?gabbro 9 Oligocene volcanics MILNE BAY Much of the Papuan Peninsula is 1–3 km above sea level and is 10A and 10B Miocene sediments and volcanics Mullins 11 Intrusive rocks, mostly Miocene-Pliocene Harbour 12A and 12B Pliocene-Quaternary sediments and volcanics 0 25 50 100 150 200 250 km underlain by a crust 25–50 km thick (Finlayson et al., 1976).
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