干旱区生态环境知识资源中心(Arid): Methane seeps following Early Permian (Sakmarian) deglaciation, interior East Gondwana, Western Australia: Multiphase carbonate cements, distinct carbon-isotope signatures, extraordinary biota

Arid

DOI	10.1016/j.palaeo.2022.110862
	Methane seeps following Early Permian (Sakmarian) deglaciation, interior East Gondwana, Western Australia: Multiphase carbonate cements, distinct carbon-isotope signatures, extraordinary biota
	Haig, David W.; Dillinger, Antoine; Playford, Geoffrey; Riera, Rosine; Sadekov, Aleksey; Skrzypek, Grzegorz; Hakansson, Eckart; Mory, Arthur J.; Peyrot, Daniel; Thomas, Charmaine
通讯作者	Haig, DW
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2022
卷号	591
英文摘要	Shallow-marine methane seeps, described here for the first time from the Australian Upper Paleozoic, are among few reported globally from the Carboniferous-Permian. Carbonate-cement fabrics, delta C-13 values and biota indicate that concentrations of nodules scattered in a narrow stratigraphic interval within the lower Holmwood Shale in the Irwin Basin formed in methane seeps. Based on ammonoids, this zone belongs within the Sakmarian. The Holmwood Shale overlies the glaciogenic Nangetty Formation that sits on crystalline Precambrian basement. The Holmwood is little deformed, shows low thermal maturation and has been covered by less than 1000 m of Permian and Neogene strata. The nodules are cementstone with complex multiphase cement fabric and 813C values (mostly,-25 --45(PDB)(V)) below the ranges for normal-marine limestone and carbonate nodules common in marine shale elsewhere. A biota preserved in nodules of the seep deposits includes representatives of three ecosystems: seep, pelagic, and coastal plain. The seep biota, new to the Australian Permian, consists of small thickets with a framework of tubeworms, less common algal-like Tubiphytes, and problematica (? algae or sponges). Other components include microbial mats, macrophyte alga Litostroma (first report from Gondwana); foraminifers; sponges with siliceous monaxon spicules; a new group of small, lightly ornamented rostroconchs; microgastropods and rare larger types; ostracods and minute scolecodonts from polychaete jaws. Elements of the pelagic ecosystem are ammonoids (abundant in enclosing shale) and marine microphytoplankton. Probable vertebrate bone (possibly amphibians) and diverse spores and pollen from land plants come from the adjoining coastal plain. The surrounding mudstone lacks benthic macrofauna but includes an unusual assemblage of siliceous agglutinated foraminifers. The seeps were oases of high organic productivity on an otherwise barren muddy seafloor. The Holmwood Shale's seep carbonates have close similarities to modern seep deposits in shallow-marine settings. They more closely resemble the modern deposits than some of the few others interpreted elsewhere from the Carboniferous-Permian, but seem close to equivalents in shale of latest Pennsylvanian (Gzhelian) age overlying glaciogenic deposits in the Namibian sector of East Gondwana. In both regions, deglaciation of Pennsylvanian ice sheets that covered large parts of East Gondwana, dewatering of melt-water from the glaciogenic sediment pile after burial, and associated release of probable biogenic methane seems to have coincided with formation of seeps.
英文关键词	Irwin Basin Carbonate nodules Carbon and oxygen isotopes Seep ecosystem Tubeworm thickets
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000792499300003
WOS关键词	RARE-EARTH-ELEMENTS ; HYDROTHERMAL VENT ; AUTHIGENIC CARBONATES ; HYDROCARBON SEEPS ; WASHINGTON-STATE ; TIMOR LESTE ; GASBENCH-II ; SEA ; COMMUNITIES ; ANCIENT
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/2XILL650/393901
推荐引用方式 GB/T 7714	Haig, David W.,Dillinger, Antoine,Playford, Geoffrey,et al. Methane seeps following Early Permian (Sakmarian) deglaciation, interior East Gondwana, Western Australia: Multiphase carbonate cements, distinct carbon-isotope signatures, extraordinary biota[J],2022,591.
APA	Haig, David W..,Dillinger, Antoine.,Playford, Geoffrey.,Riera, Rosine.,Sadekov, Aleksey.,...&Thomas, Charmaine.(2022).Methane seeps following Early Permian (Sakmarian) deglaciation, interior East Gondwana, Western Australia: Multiphase carbonate cements, distinct carbon-isotope signatures, extraordinary biota.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,591.
MLA	Haig, David W.,et al."Methane seeps following Early Permian (Sakmarian) deglaciation, interior East Gondwana, Western Australia: Multiphase carbonate cements, distinct carbon-isotope signatures, extraordinary biota".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 591(2022).