气候变化领域集成服务门户(CCPortal): Paleoenvironmental changes during the late Albian oceanic anoxic event 1d: An example from the Capacho Formation; southwestern Venezuela

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DOI	10.1016/j.palaeo.2019.02.010
	Paleoenvironmental changes during the late Albian oceanic anoxic event 1d: An example from the Capacho Formation; southwestern Venezuela
	Rodríguez-Cuicas M.-E.; Montero-Serrano J.-C.; Garbán G.
发表日期	2019
ISSN	0031-0182
起始页码	10
结束页码	29
卷号	521
英文摘要	The late Albian–early Cenomanian oceanic anoxic event 1d (OAE-1d; ~103 to 99.5 Ma) represents a global interval of enhanced organic carbon burial due to widespread oxygen deficiency in the water column and/or increased primary productivity. The biostratigraphy and geochemistry of organic-rich sediments in the La Grita Member (Capacho Formation) in southwestern Venezuela were studied to document the paleoenvironmental conditions that governed the deposition of this succession during OAE-1d. Carbon-isotope (δ 13 C carb and δ 13 C Corg ) chemostratigraphy and biostratigraphic constraints show that the La Grita Member spans the late Aptian period (Rotalipora appenninica Zone), and that OAE-1d is well recorded in this succession. A prominent increase in total organic carbon (TOC) values (up to 10%) is clearly recorded through the onset of OAE-1d, coinciding with a prominent change in overall redox-sensitive proxies suggesting that the La Grita Member sediments accumulated under anoxic (and possibly euxinic) bottom-water conditions in a partially restricted basin. The detrital proxies suggest that the greenhouse climate prevailing during OAE-1d induced significant acceleration of the hydrologic cycle and an increase in continental chemical weathering rates. Overall, the carbon and oxygen isotope records, TOC contents, as well as the detrital proxies show cyclic variation during the late Albian stage. These variations support the hypothesis that orbital forcing likely also modulated the equatorial monsoonal activity during the OAE-1d. © 2019 Elsevier B.V.
英文关键词	Biostratigraphy; Mid-cretaceous; Paleoenvironment; Redox conditions; Sedimentary geochemistry; Stable isotopes
语种	英语
scopus关键词	Albian; anoxic conditions; biostratigraphy; bottom water; burial (geology); carbon isotope; Cenomanian; chemical weathering; chemostratigraphy; deposition; environmental change; geochemistry; historical record; orbital forcing; organic carbon; oxygen isotope; paleoenvironment; primary production; redox conditions; sediment chemistry; stable isotope; water column; Venezuela; Rotalipora
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151015
作者单位	Instituto de Ciencias de la Tierra, Universidad Central de Venezuela, 3895, Caracas, 1010-A, Venezuela; Institut des sciences de la mer de Rimouski, Université du Québec, à Rimouski, 310 allée des Ursulines, Rimouski, Quebec G5L 3A1, Canada; GEOTOP Research Center, C.P. 8888, succursale centre-ville, Montreal, Quebec H3C 3P8, Canada; DTP Laboratorios SRL, Condarco, Buenos Aires 1136, Argentina
推荐引用方式 GB/T 7714	Rodríguez-Cuicas M.-E.,Montero-Serrano J.-C.,Garbán G.. Paleoenvironmental changes during the late Albian oceanic anoxic event 1d: An example from the Capacho Formation; southwestern Venezuela[J],2019,521.
APA	Rodríguez-Cuicas M.-E.,Montero-Serrano J.-C.,&Garbán G..(2019).Paleoenvironmental changes during the late Albian oceanic anoxic event 1d: An example from the Capacho Formation; southwestern Venezuela.Palaeogeography, Palaeoclimatology, Palaeoecology,521.
MLA	Rodríguez-Cuicas M.-E.,et al."Paleoenvironmental changes during the late Albian oceanic anoxic event 1d: An example from the Capacho Formation; southwestern Venezuela".Palaeogeography, Palaeoclimatology, Palaeoecology 521(2019).