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学科主题: Geosciences, Multidisciplinary
题名: The provenance of Middle Jurassic sandstones in the Scotian Basin: petrographic evidence of passive margin tectonics
作者: Li, G ; Pe-Piper, G ; Piper, DJW
通讯作者: dpiper@nrcan.gc.ca
刊名: CANADIAN JOURNAL OF EARTH SCIENCES
发表日期: 2012
卷: 49, 期:12, 页:1463-1477
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
项目归属: 海洋地质
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.
语种: 英语
WOS记录号: WOS:000312375300005
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10289
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Li, G; Pe-Piper, G; Piper, DJW.The provenance of Middle Jurassic sandstones in the Scotian Basin: petrographic evidence of passive margin tectonics,CANADIAN JOURNAL OF EARTH SCIENCES,2012,49(12):1463-1477
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