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The provenance of Middle Jurassic sandstones in the Scotian Basin: petrographic evidence of passive margin tectonics
Li, G; Pe-Piper, G; Piper, DJW; dpiper@nrcan.gc.ca
2012
发表期刊CANADIAN JOURNAL OF EARTH SCIENCES
ISSN0008-4077
卷号49期号:12页码:1463-1477
摘要The tectonic and geomorphological evolution of the Scotian margin and its hinterland is poorly known between Late Triassic rifting and the Early Cretaceous progradation of major deltas. This study determined sedimentary provenance of Middle Jurassic Mohican Formation sandstones from three wells using heavy minerals and mineral chemistry. Indicator minerals such as xenotime, altered ilmenite, and varietal types of garnet and tourmaline are similar to those in Hauterivian-Barremian sandstones in the western Scotian Basin, which are almost exclusively derived from the Meguma terrane. The wells adjacent to the Canso Ridge have more zircon and less ilmenite, indicating a greater contribution of polycyclic reworking, but with an ultimate source in the Meguma terrane. Zircon and ilmenite were likely derived in part from Carboniferous sandstones in eastern mainland Nova Scotia and Cape Breton Island. Any river drainage from the inboard terranes of the Appalachians either was diverted through the Fundy Basin or entered the easternmost Scotian Basin, where the Mohican Formation is 5.5 km thick, along the linear continuation of the southwest Grand Banks transform. Such sediment did not reach the Canso Ridge, suggesting that the Cobequid-Chedabucto fault zone in Orpheus graben was not a significant physiographic feature. This tectonically controlled paleogeography in the Middle Jurassic is quite different from that during active rifting in the Late Triassic - Early Jurassic. Middle Jurassic quiescence was followed in the Tithonian - Early Cretaceous by renewed tectonic uplift associated with rifting of Grand Banks from Iberia and Labrador from Greenland.
部门归属[Piper, David J. W.] Geol Survey Canada Atlantic, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada; [Li, Gang] S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Pe-Piper, Georgia] St Marys Univ, Dept Geol, Halifax, NS B3H 3C3, Canada
学科领域Geosciences, Multidisciplinary
语种英语
资助项目海洋地质
WOS记录号WOS:000312375300005
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10289
专题中科院边缘海地质重点实验室
通讯作者dpiper@nrcan.gc.ca
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GB/T 7714
Li, G,Pe-Piper, G,Piper, DJW,et al. The provenance of Middle Jurassic sandstones in the Scotian Basin: petrographic evidence of passive margin tectonics[J]. CANADIAN JOURNAL OF EARTH SCIENCES,2012,49(12):1463-1477.
APA Li, G,Pe-Piper, G,Piper, DJW,&dpiper@nrcan.gc.ca.(2012).The provenance of Middle Jurassic sandstones in the Scotian Basin: petrographic evidence of passive margin tectonics.CANADIAN JOURNAL OF EARTH SCIENCES,49(12),1463-1477.
MLA Li, G,et al."The provenance of Middle Jurassic sandstones in the Scotian Basin: petrographic evidence of passive margin tectonics".CANADIAN JOURNAL OF EARTH SCIENCES 49.12(2012):1463-1477.
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