干旱区生态环境知识资源中心(Arid): ICHNOFABRICS FROM A CRETACEOUS EOLIAN SYSTEM OF WESTERN ARGENTINA: EXPANDING THE APPLICATION OF CORE ICHNOLOGY TO DESERT ENVIRONMENTS

Arid

DOI	10.2110/palo.2018.110
	ICHNOFABRICS FROM A CRETACEOUS EOLIAN SYSTEM OF WESTERN ARGENTINA: EXPANDING THE APPLICATION OF CORE ICHNOLOGY TO DESERT ENVIRONMENTS
	Buatois, Luis A.1; Echevarria, Carlos 2,3
通讯作者	Buatois, Luis A.
来源期刊	PALAIOS
ISSN	0883-1351
EISSN	1938-5323
出版年	2019
卷号	34 期号:4 页码:190-211
英文摘要	The Lower Cretaceous (Valanginian) Mulichinco Formation of the Neuquen Basin in western Argentina is host to important hydrocarbon reservoirs, encompassing a wide variety of sedimentary facies, including thick eolian deposits in its lower interval in proximal positions. Ten ichnofabrics are characterized based on the analysis of cores from the El Mangrullo oil field. These ichnofabrics have been grouped in four associations, representing eolian dunes, eolian sand sheets, interdunes, and fluvial sheet floods. In terms of the ichnofacies model, both the Scoyenia and Octopodichnus-Entradichnus ichnofacies are identified. Ichnologic information has been integrated with sedimentologic and sequence-stratigraphic information. The studied succession comprises a 3rd -order depositional sequence that is subdivided into three 4th-order sequences stacked in a backstepping pattern as a result of a rise in the water table. The base of the 3rd -order sequence is represented by the intra-Valanginian unconformity that in this area separates marine deposits below from continental deposits above. Overall the 3rd -order sequence reflects the vertical transition from a dominance of eolian dune deposits to eolian sand sheet and fluvial sheet flood deposits, the latter intercalating with marginal-marine intervals. Application of available conceptual frameworks to understand trace-fossil distribution in desert environments suggests that the eolian Mulichinco ichnofauna indicates a temporal evolution from hyper-arid to arid and semi-arid conditions. The results of the present analysis argue against the common assumption of deserts as barren of life and provide further support to the notion of an archetypal eolian ichnofacies. This study expands the realm of application of ichnology in subsurface to colian environments by providing a characterization of an ichnofauna from a desert setting based on core analysis.
类型	Article
语种	英语
国家	Canada ; Argentina
收录类别	SCI-E
WOS记录号	WOS:000465625300001
WOS关键词	TRACE FOSSILS ; MULICHINCO FORMATION ; NEUQUEN BASIN ; SANDSTONE ; BIOTURBATION ; DEPOSITS ; RIVER ; ARCHITECTURE ; SKOLITHOS ; BURROWS
WOS类目	Geology ; Paleontology
WOS研究方向	Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217873
作者单位	1.Univ Saskatchewan, Dept Geol Sci, 114 Sci Pl, Saskatoon, SK S7N 5E2, Canada; 2.Petrobras Argentina SA, Neuquen, Argentina; 3.Pampa Energia, Buenos Aires, DF, Argentina
推荐引用方式 GB/T 7714	Buatois, Luis A.,Echevarria, Carlos. ICHNOFABRICS FROM A CRETACEOUS EOLIAN SYSTEM OF WESTERN ARGENTINA: EXPANDING THE APPLICATION OF CORE ICHNOLOGY TO DESERT ENVIRONMENTS[J],2019,34(4):190-211.
APA	Buatois, Luis A.,&Echevarria, Carlos.(2019).ICHNOFABRICS FROM A CRETACEOUS EOLIAN SYSTEM OF WESTERN ARGENTINA: EXPANDING THE APPLICATION OF CORE ICHNOLOGY TO DESERT ENVIRONMENTS.PALAIOS,34(4),190-211.
MLA	Buatois, Luis A.,et al."ICHNOFABRICS FROM A CRETACEOUS EOLIAN SYSTEM OF WESTERN ARGENTINA: EXPANDING THE APPLICATION OF CORE ICHNOLOGY TO DESERT ENVIRONMENTS".PALAIOS 34.4(2019):190-211.