干旱区生态环境知识资源中心(Arid): Neoproterozoic marine chemostratigraphy, or eustatic sea level change?

Arid

DOI	10.1016/j.palaeo.2020.110155
	Neoproterozoic marine chemostratigraphy, or eustatic sea level change?
	Retallack, Gregory J.; Broz, Adrian P.; Lai, Larry S-H; Gardner, Kevin
通讯作者	Retallack, GJ (corresponding author), Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA.
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2021
卷号	562
英文摘要	Paleosols are characterized with new chemical and petrographic data from the Tonian (776-729 Ma) Chuar Group in the eastern Grand Canyon, Arizona. Paleosols have been discovered at 66 stratigraphic levels in a 1622 m sequence largely of marine shales and thin intertidal stromatolitic dolostones. A purple paleosol association includes gypsum desert roses in profiles like Gypsids of hyperarid climates. A red paleosol association includes calcareous nodules profiles like Calcids of semiarid climates. Degree of weathering and phosphorus depletion of the paleosols is evidence of microbial-earth communities gaining in productivity during the Tonian. The gypsic to calcic soil transition in the modern Atacama Desert of Chile corresponds with a transition from simple actinobacterial-cyanobacterial microbial earths to complex algal-fungal communities of markedly greater weathering effectiveness and carbon sequestration. A similar change in biological weathering may have induced Snowball Earth 12 Myrs after deposition of the Chuar Group. Paleosols are found only at levels of the Chuar Group where delta C-13 isotopic composition of both organic matter and of carbonate are below marine and mantle values. Although such inflections in isotopic time series have been considered chemostratigraphic markers of global oceanic composition, in this case we interpret them to reflect a change in sea level from shallow marine to terrestrial. A notable inflection at about 752 Ma in the Chuar Group corresponds with the recently recognized Konnarock Glaciation of Virginia, and may have been a time of global sea-level fall. Correlation of Precambrian marine sequences by wiggle matching isotopic time series may still be effective, but because of sea-level change rather than for the chemical oceanographic reasons originally envisaged.
英文关键词	Neoproterozoic Paleosol Paleokarst Snowball Earth Chuar Group
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000604584600067
WOS关键词	BITTER SPRINGS FORMATION ; 2011 PROBLEMATIC MEGAFOSSILS ; VASE-SHAPED MICROFOSSILS ; PROTEROZOIC CHUAR GROUP ; OXYGEN-ISOTOPE RATIOS ; UINTA MOUNTAIN GROUP ; GRAND-CANYON ; ATACAMA DESERT ; CAMBRIAN PALEOSOLS ; HYPERARID MARGIN
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348084
作者单位	[Retallack, Gregory J.; Broz, Adrian P.; Lai, Larry S-H; Gardner, Kevin] Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA
推荐引用方式 GB/T 7714	Retallack, Gregory J.,Broz, Adrian P.,Lai, Larry S-H,et al. Neoproterozoic marine chemostratigraphy, or eustatic sea level change?[J],2021,562.
APA	Retallack, Gregory J.,Broz, Adrian P.,Lai, Larry S-H,&Gardner, Kevin.(2021).Neoproterozoic marine chemostratigraphy, or eustatic sea level change?.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,562.
MLA	Retallack, Gregory J.,et al."Neoproterozoic marine chemostratigraphy, or eustatic sea level change?".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 562(2021).