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Short-Term Sea Level Changes of the Upper Cretaceous Carbonates: Calibration Between Palynomorphs Composition, Inorganic Geochemistry, and Stable Isotopes

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Short-Term Sea Level Changes of the Upper Cretaceous Carbonates: Calibration Between Palynomorphs Composition, Inorganic Geochemistry, and Stable Isotopes minerals Article Short-Term Sea Level Changes of the Upper Cretaceous Carbonates: Calibration between Palynomorphs Composition, Inorganic Geochemistry, and Stable Isotopes Ahmed Mansour 1 , Thomas Gentzis 2,* , Michael Wagreich 3 , Sameh S. Tahoun 4 and Ashraf M.T. Elewa 1 1 Geology Department, Faculty of Science, Minia University, Minia 61519, Egypt; [email protected] (A.M.); [email protected] (A.M.T.E.) 2 Core Laboratories LP, 6316 Windfern Road, Houston, TX 77040, USA 3 Department of Geology, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, 1090 Vienna, Austria; [email protected] 4 Geology Department, Faculty of Science, Cairo University, Giza 12613, Egypt; [email protected] * Correspondence: [email protected]; Tel.: +1-713-328-2556 Received: 10 November 2020; Accepted: 4 December 2020; Published: 7 December 2020 Abstract: Widespread deposition of pelagic-hemipelagic sediments provide an archive for the Late Cretaceous greenhouse that triggered sea level oscillations. Global distribution of dinoflagellate cysts (dinocysts) exhibited a comparable pattern to the eustatic sea level, and thus, considered reliable indicators for sea level and sequence stratigraphic reconstructions. Highly diverse assemblage of marine palynomorphs along with elemental proxies that relate to carbonates and siliciclastics and bulk carbonate δ13C and δ18O from the Upper Cretaceous Abu Roash A Member were used to reconstruct short-term sea level oscillations in the Abu Gharadig Basin, southern Tethys. Additionally, we investigated the relationship between various palynological, elemental, and isotope geochemistry parameters and their response to sea level changes and examined the link between these sea level changes and Late Cretaceous climate. This multiproxy approach revealed that a long-term sea-level rise, interrupted by minor short-term fall, was prevalent during the Coniacian-earliest Campanian in the southern Tethys, which allowed to divide the studied succession into four complete and two incomplete 3rd order transgressive-regressive sequences. Carbon and oxygen isotopes of bulk hemipelagic carbonates were calibrated with gonyaulacoids and freshwater algae 13 (FWA)-pteridophyte spores and results showed that positive δ Ccarb trends were consistent, in part, with excess gonyaulacoid dinocysts and reduced FWA-spores, reinforcing a rising sea level and vice 18 versa. A reverse pattern was shown between the δ Ocarb and gonyaulacoid dinocysts, where negative 18 δ Ocarb trends were slightly consistent with enhanced gonyaulacoid content, indicating a rising sea level and vice versa. However, stable isotope trends were not in agreement with palynological calibrations at some intervals. Therefore, the isotope records can be used as reliable indicators for reconstructing changes in long-term sea level rather than short-term oscillations. Keywords: sequence palynology; dinoflagellate cysts; gonyaulacoid dinocysts; stable carbon and oxygen isotopes; major and trace elements; southern Tethys; Late Cretaceous sea level 1. Introduction From the onset of the Late Cretaceous, a global long-term marine sea-level high occurred with a peak estimate of 170 to 250 m above the present sea level (Figure1)[ 1–3]. This caused a major Minerals 2020, 10, 1099; doi:10.3390/min10121099 www.mdpi.com/journal/minerals MineralsMinerals2020 2020, 10, 10, 1099, x FOR PEER REVIEW 2 of2 of23 22 transgressive event in the Tethys Ocean that almost flooded northern Africa [2] and extended beyond transgressivethe Egyptian event borders in theto the Tethys south Ocean in the that Khartoum, almost floodedMelut, and northern Muglad Africa basins [2 ]of and southern extended Sudan beyond [4]. theShort-term Egyptian stratigraphic borders to the sequences, south in themainly Khartoum, third an Melut,d fourth and order, Muglad and basinssea level of southernreconstruction Sudan are [4 ]. Short-termcritical for stratigraphic understanding sequences, local to mainlyregional third environmental and fourth order,processes and seaand levelrelated reconstruction deposition of are criticalsediments for understanding from the southern local toTethys, regional particularly environmental the Abu processes Gharadig and relatedBasin, north deposition Western of sediments Desert, fromEgypt. the southern Tethys, particularly the Abu Gharadig Basin, north Western Desert, Egypt. FigureFigure 1. 1.Global Global dinoflagellate dinoflagellate cystcyst diversitydiversity through the Mesozoic [5,6] [5,6] as as well well as as absolute absolute percentage percentage ofof dinoflagellate dinoflagellate cystcyst generagenera originationorigination duringduring the Cretaceous [6] [6] and and their their significant significant positive positive correlationcorrelation with with the the eustatic eustatic sea sea level level [2]. [2]. Current Current study study sea levelsea level curve curve is constructed is constructed based onbased various on palynologicalvarious palynological components components with further with details further discussed details discussed below. The below. geologic The geologic time interval time interval is referred is toreferred GTS2012 to [ 7GTS2012]. Be, Berriasian; [7]. Be, Berriasian; Va, Valanginian; Va, Valangin Ha, Hauterivian;ian; Ha, Hauterivian; Ba, Barremian; Ba, Barremian; Ap, Aptian; Ap, Al, Aptian; Albian; Ce,Al, Cenomanian; Albian; Ce, Tu,Cenomanian; Turonian; Co,Tu, Coniacian;Turonian; Sa,Co, Santonian; Coniacian; Ca, Sa, Campanian; Santonian; Ma,Ca, Maastrichtian.Campanian; Ma, Maastrichtian. Correlating the stratigraphic vertical variations in the relative evenness and richness of marine phytoplanktonCorrelating versus the stratigraphic terrestrially vertical derived variations palynomorphs in the relative is widely evenness acknowledged and richness as an of approach marine tophytoplankton define the magnitude versus terrestrially of sea-level derived transgressive-regressive palynomorphs is widely trends acknowledged and systems tractsas an inapproach offshore sedimentaryto define the facies magnitude [5,6,8– of14 ].sea-level Most interestingly,transgressive-regressive the organic-walled trends and dinocysts systems tracts species in offshore diversity showedsedimentary significantly facies [5,6,8–14]. similar trends Most interestingl to the eustaticy, the sea organic-walled level curve fromdinocysts their species first appearance diversity duringshowed the significantly Triassic up similar to the trends Cretaceous to the eustatic (Figure sea1), level make curve them from reliable their first indicators appearance of sea during level transgression-regressionthe Triassic up to the Cretaceous cycles [12 (Figure,14,15]. 1), Common make them types reliable of sequence indicators stratigraphy of sea level were transgression- summarized intoregression depositional, cycles genetic, [12,14,15]. and transgressive-regressiveCommon types of sequence sequences stratigraphy [16]. However, were summarized thick stratigraphic into intervalsdepositional, of pelagic-hemipelagic genetic, and transgressive-regressi carbonate sedimentsve sequences make it [16]. diffi cultHowever, to delineate thick stratigraphic depositional andintervals/or genetic of pelagic-hemipelagic sequence compared carbonate to siliciclastic-carbonate sediments make successionsit difficult to as delineate is the case depositional in the Abu Roashand/or A genetic Member. sequence In this compared study, the to transgressive-regressivesiliciclastic-carbonate successions sequence as stratigraphy is the case in [16 the,17 ]Abu was usedRoash because A Member. of the In carbonate this study, nature the transgressive-re of the studiedgressive interval sequence and easiness stratigraphy of reconstruction [16,17] was within used a stratigraphic sequence. Minerals 2020, 10, 1099 3 of 22 Generally, the content of major and trace elements and their ratios in sediments are used to investigate redox conditions, continental weathering, role of terrestrial/riverine input, and fluctuations in relative sea level [12,18–23]. Carbon and oxygen isotope chemostratigraphy are commonly used as a reliable proxy for greenhouse/icehouse climatic, oceanographic, and sea level investigations [20,24–26]. In addition to the palynological- and geochemical-based sea level reconstructions, stable carbon and oxygen isotope records were used herein for their reliability as proxies for sea level changes side by side with several palynomorphs categories. The current study is part of a larger project of the relatively understudied Abu Roash Formation in the Abu Gharadig Basin of the north Western Desert, Egypt. In this context, the most prominent publications related to the Abu Roash A Member focused on detailed biostratigraphy, palynological, and palynofacies analysis, redox conditions and other environmental aspects [14,23]. Therefore, the aim of the current study is to: (1) investigate the Tethyan widespread transgression and reconstruct short-term changes in sea level and systems tracts through the Abu Gharadig Basin, based on palynomorphs composition; (2) investigate the relationship and overall trends between various palynological categories and elemental geochemistry and stable isotope records; and (3) examine whether there is a relationship and/or a link between Late Cretaceous climate and sea level changes. 2. Geologic and Stratigraphic Settings In this part of the southern Tethys where the study area is located, a NE–SW extensional regime was active from the Jurassic to Early Cretaceous due to
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