Recycling History, Maturity, Paleoweathering, and Paleoclimatic Conditions of the Campano-Maastrichtian Sandstones in the Northern Bida Basin, Nigeria

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This study analyzed Campanian-Maastrichtian sandstones from Nigeria, revealing sediment recycling, intense weathering under warm humid climates, and a felsic rock provenance on a passive margin.

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The study logged and sampled Campanian–Maastrichtian sandstone and siltstone facies from the Bida and Enagi formations in the northern Bida Basin, Nigeria, analyzing petrography, mineralogy (XRD), and bulk geochemistry to infer sediment recycling history, maturity, paleoweathering, and paleoclimatic conditions. Petrographic and mineralogical results indicate that Bida sandstones are mostly quartzarenite (minor sublitharenite), while Enagi sandstones are mainly sublitharenite (minor quartzarenite), with XRD showing higher kaolinite and trace muscovite, anatase, and iron-rich minerals, consistent with significant post-depositional weathering prior to reworking. Geochemical weathering indices (CIA, CIW, PIA, CPA) and A–CN–K/A–CNK–FM plots suggest intense weathering and reworking in the late Cretaceous source area, while rare earth element patterns and discrimination plots point to a felsic provenance in a passive margin tectonic setting and deposition under warm, temperate to tropical humid conditions with semi-humid dominance and brief semi-arid intervals. As a geochemical and petrographic characterization study of Late Cretaceous sandstones, it does not explicitly address any biological processes or mechanisms relevant to endometriosis or adenomyosis. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The Campanian-Maastrichtian sandstone and siltstone facies of the Bida and Enagi formations, northern Bida Basin Nigeria were logged and sampled. The study aims to evaluate the sandstone's petrographic, mineralogical, and bulk geochemical compositions. This is towards exemplifying sediment recycling, maturity, paleoweathering history, and the prevailing paleoclimatic conditions during depositions in the parts of Bida Basin. Petrography result reveals framework modal composition of Bida Formation sandstones as Q 93.51−100 F 0−2.60 L/R 0 − 3.90 whereas the Enagi Formation sandstones constituents includes Q 84.42−98.72 F 0−3.75 L/R 1.18−15.58 , thus the Bida Formation sandstones are classified as mostly quartzarenite with minor sublitharenite whereas Enagi Formation sandstone are basically classified as sublitharenite with minor quartzarenite varieties. Mineralogical composition from the X-ray diffractions revealed higher kaolinite contents among the mineral constitutes with relatively high quartz contents while muscovite, anatase and iron-rich minerals (goethite and hematite) were recorded in trace amounts and this suggests significant post-depositional weathering prior to reworking. Higher geochemical weathering indices values, including chemical index of alteration (CIA), chemical index of weathering (CIW), plagioclase index of alteration (PIA), and chemical proxy for alteration (CPA), as well as the ternary A-CN-K and A-CNK-FM plots for both Bida and Enagi formations, suggest an intense weathering and reworking at the source area during late Cretaceous. Geochemical proxies, weathering indices and plots show that the compositionally mature to super mature sediments were deposited under warm, temperate to tropical humid climatic paleoclimatic settings. The light rare earth elements (LREE) enrichment relative to heavy rare earth elements (HREE) and low negative europium (Eu/Eu*) anomaly values with geochemical discrimination plots revealed that the sandstones were sourced from a felsic rocks’ provenance within a passive margin paleotectonic settings. This study concluded that the Campano-Maastrichtian Bida and Enagi formations siliciclastic sediments in the northern Bida sub-Basin, northcentral Nigeria were subjected to extreme weathering, during a warm, temperate to tropical humid climate with the dominance of semi-humid and only brief semi-arid conditions.
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Recycling History, Maturity, Paleoweathering, and Paleoclimatic Conditions of the Campano-Maastrichtian Sandstones in the Northern Bida Basin, Nigeria | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Recycling History, Maturity, Paleoweathering, and Paleoclimatic Conditions of the Campano-Maastrichtian Sandstones in the Northern Bida Basin, Nigeria Suraju Adepoju, Olusola Johnson, Bulusu Sreenivas, Samuel Akande This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-2305761/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The Campanian-Maastrichtian sandstone and siltstone facies of the Bida and Enagi formations, northern Bida Basin Nigeria were logged and sampled. The study aims to evaluate the sandstone's petrographic, mineralogical, and bulk geochemical compositions. This is towards exemplifying sediment recycling, maturity, paleoweathering history, and the prevailing paleoclimatic conditions during depositions in the parts of Bida Basin. Petrography result reveals framework modal composition of Bida Formation sandstones as Q 93.51−100 F 0−2.60 L/R 0 − 3.90 whereas the Enagi Formation sandstones constituents includes Q 84.42−98.72 F 0−3.75 L/R 1.18−15.58 , thus the Bida Formation sandstones are classified as mostly quartzarenite with minor sublitharenite whereas Enagi Formation sandstone are basically classified as sublitharenite with minor quartzarenite varieties. Mineralogical composition from the X-ray diffractions revealed higher kaolinite contents among the mineral constitutes with relatively high quartz contents while muscovite, anatase and iron-rich minerals (goethite and hematite) were recorded in trace amounts and this suggests significant post-depositional weathering prior to reworking. Higher geochemical weathering indices values, including chemical index of alteration (CIA), chemical index of weathering (CIW), plagioclase index of alteration (PIA), and chemical proxy for alteration (CPA), as well as the ternary A-CN-K and A-CNK-FM plots for both Bida and Enagi formations, suggest an intense weathering and reworking at the source area during late Cretaceous. Geochemical proxies, weathering indices and plots show that the compositionally mature to super mature sediments were deposited under warm, temperate to tropical humid climatic paleoclimatic settings. The light rare earth elements (LREE) enrichment relative to heavy rare earth elements (HREE) and low negative europium (Eu/Eu*) anomaly values with geochemical discrimination plots revealed that the sandstones were sourced from a felsic rocks’ provenance within a passive margin paleotectonic settings. This study concluded that the Campano-Maastrichtian Bida and Enagi formations siliciclastic sediments in the northern Bida sub-Basin, northcentral Nigeria were subjected to extreme weathering, during a warm, temperate to tropical humid climate with the dominance of semi-humid and only brief semi-arid conditions. Sandstone Bida Basin Late Cretaceous Geochemistry Maturity Paleoweathering Paleoclimate Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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