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- W2973164057 endingPage "103032" @default.
- W2973164057 startingPage "103032" @default.
- W2973164057 abstract "Abstract Marine red beds (MRB) have been commonly interpreted as products of bottom water oxygenation (or ventilation) and coeval perturbations of the global carbon cycle during greenhouse climates. The Sandbian (Upper Ordovician) successions at Dawangou and Nanyigou in NW Tarim, China are characterized by deep-shelf nodular red limestones. Using ultraviolet-visible-near infrared (UV-VIS-NIR) diffuse reflectance spectroscopy (DRS), field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray spectrometer (EDS), and paired inorganic and organic carbon isotope systematics, this study attempts to reveal the origin of these MRBs and coeval carbon cycling during deposition. Both the DRS and FESEM results consistently show that these red limestones are exclusively impregnated with amorphous to poorly crystalline, submicron ferric oxides (mostly hematite), constituting the dominant components of the red pigment. Hematite aggregates (or lumps) occur either in the calcite crystal interstices and pores or within the lattice structure of calcite crystals, implicating early diagenetic or syndepositional origins. Paired organic and inorganic carbon isotope data through the MRB successions demonstrate a time-specific Sandbian positive carbon isotope plateau (~1 to 2‰ VPDB) in both fractions as reported elsewhere around the world. This may have intitially resulted from enhanced burial of organic matter, then a drawdown of atmospheric pCO2 levels, and subsequent climate cooling. This scenario agrees with the decreasing isotope difference (Δ13C = δ13Ccarb−δ13Corg; ~26‰VPDB on average) in the Sandbian MRBs relative to the underlying strata (~29‰ VPDB) from both sections. A cooling climate could have accelerated oceanic ventilation rates and led to increased oxygenation of deep-shelf water masses, eventually facilitating the widespread deposition of MRBs near continental margins. The persistence of a cool climate and the expansion of oxygenated deep-shelf water masses onto the shelf that initiated during the Darriwilian may have stimulated the rapid biodiversification of marine organisms during the Sandbian." @default.
- W2973164057 created "2019-09-19" @default.
- W2973164057 creator A5023348100 @default.
- W2973164057 creator A5027181861 @default.
- W2973164057 creator A5057254089 @default.
- W2973164057 creator A5060956126 @default.
- W2973164057 creator A5076606414 @default.
- W2973164057 creator A5087877306 @default.
- W2973164057 date "2019-12-01" @default.
- W2973164057 modified "2023-10-17" @default.
- W2973164057 title "Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?" @default.
- W2973164057 cites W1420059796 @default.
- W2973164057 cites W1508541454 @default.
- W2973164057 cites W1682441798 @default.
- W2973164057 cites W1918983804 @default.
- W2973164057 cites W1937794421 @default.
- W2973164057 cites W1964509100 @default.
- W2973164057 cites W1972312245 @default.
- W2973164057 cites W1973192022 @default.
- W2973164057 cites W1979503027 @default.
- W2973164057 cites W1980392563 @default.
- W2973164057 cites W1984976018 @default.
- W2973164057 cites W1986916739 @default.
- W2973164057 cites W1989230282 @default.
- W2973164057 cites W1991657621 @default.
- W2973164057 cites W1994473632 @default.
- W2973164057 cites W1995007149 @default.
- W2973164057 cites W1995355123 @default.
- W2973164057 cites W1998179964 @default.
- W2973164057 cites W2004722069 @default.
- W2973164057 cites W2006730812 @default.
- W2973164057 cites W2006761122 @default.
- W2973164057 cites W2008443718 @default.
- W2973164057 cites W2011440133 @default.
- W2973164057 cites W2014389964 @default.
- W2973164057 cites W2017132926 @default.
- W2973164057 cites W2018665120 @default.
- W2973164057 cites W2018759535 @default.
- W2973164057 cites W2020434687 @default.
- W2973164057 cites W2028823240 @default.
- W2973164057 cites W2029084214 @default.
- W2973164057 cites W2031481912 @default.
- W2973164057 cites W2034890738 @default.
- W2973164057 cites W2036563260 @default.
- W2973164057 cites W2044282583 @default.
- W2973164057 cites W2049406417 @default.
- W2973164057 cites W2058188237 @default.
- W2973164057 cites W2060031764 @default.
- W2973164057 cites W2060043713 @default.
- W2973164057 cites W2065212429 @default.
- W2973164057 cites W2075733243 @default.
- W2973164057 cites W2076897940 @default.
- W2973164057 cites W2079460003 @default.
- W2973164057 cites W2082419916 @default.
- W2973164057 cites W2084168747 @default.
- W2973164057 cites W2086729925 @default.
- W2973164057 cites W2087292482 @default.
- W2973164057 cites W2087985655 @default.
- W2973164057 cites W2089128863 @default.
- W2973164057 cites W2101755680 @default.
- W2973164057 cites W2106510991 @default.
- W2973164057 cites W2106970725 @default.
- W2973164057 cites W2121839724 @default.
- W2973164057 cites W2142772539 @default.
- W2973164057 cites W2145685810 @default.
- W2973164057 cites W2148013722 @default.
- W2973164057 cites W2151199706 @default.
- W2973164057 cites W2151454454 @default.
- W2973164057 cites W2161979309 @default.
- W2973164057 cites W2162204259 @default.
- W2973164057 cites W2163012474 @default.
- W2973164057 cites W2163252553 @default.
- W2973164057 cites W2164336439 @default.
- W2973164057 cites W2165865816 @default.
- W2973164057 cites W2166469808 @default.
- W2973164057 cites W2167236431 @default.
- W2973164057 cites W2167980989 @default.
- W2973164057 cites W2208442684 @default.
- W2973164057 cites W2263543752 @default.
- W2973164057 cites W2277242164 @default.
- W2973164057 cites W2282248705 @default.
- W2973164057 cites W2323490829 @default.
- W2973164057 cites W2338621325 @default.
- W2973164057 cites W2380174152 @default.
- W2973164057 cites W2404385593 @default.
- W2973164057 cites W2406418823 @default.
- W2973164057 cites W2528114952 @default.
- W2973164057 cites W2590381388 @default.
- W2973164057 cites W2595024260 @default.
- W2973164057 cites W263622940 @default.
- W2973164057 cites W2731396358 @default.
- W2973164057 cites W2732619521 @default.
- W2973164057 cites W2750391460 @default.
- W2973164057 cites W2760546791 @default.
- W2973164057 cites W2765722401 @default.
- W2973164057 cites W2767067382 @default.
- W2973164057 cites W2770735458 @default.
- W2973164057 cites W2774143882 @default.