气候变化领域集成服务门户(CCPortal): Late Mesozoic sediment provenance on Georges Bank: Enlargement of river drainages to the Atlantic Ocean in the Late Jurassic

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DOI	10.1306/10261817348
	Late Mesozoic sediment provenance on Georges Bank: Enlargement of river drainages to the Atlantic Ocean in the Late Jurassic–Early Cretaceous
	Chavez I.; Pe-Piper G.; Piper D.J.W.; Andrew MacRae R.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:6
英文摘要	The detrital mineralogy of Upper Jurassic to Lower Cretaceous sandstones from the Continental Offshore Stratigraphic Test G-2 well in the Georges Bank Basin was studied to better understand the varying supply of clastic sediment to the basin. Heavy minerals separated from cuttings were identified by chemical analyses, zircons were dated, and Raman spectroscopy was applied to identify titania polymorphs (rutile, anatase, and brookite). Upper Jurassic (Oxfordian) sands contain tourmaline, fluorapatite, Mn-almandine and grossular garnets (derived from the central Maine and coastal Maine belts), and pumice and trachytes reworked from volcanics in the Long Island platform. Zircon geochronology (300–450 and 550–700 Ma) supports sources from peri-Gondwanan Appalachian terranes. Lower Cretaceous heavy minerals show that Oxfordian supply was diluted to 30%, mostly by additional ilmenite, zircon, tourmaline, and staurolite, probably by components from central and northern Maine and New Brunswick. Rutile and anatase from metapelites are more common than in the Oxfordian, where mafic igneous sources predominate. Lower Cretaceous zircons include a few Mesoproterozoic grains that might be reworked from middle Paleozoic sedimentary rocks in the Gander terrane of northern Maine and New Brunswick, although subhedral grains together with rare chromite may indicate minor or intermittent supply from the Sable River draining Labrador. Heavy minerals provided important provenance information not available from zircon geochronology alone. Progressive enlargement of the catchment area resulted from an increasingly humid climate in the latest Jurassic and active mostly northeast-trending faults in the Early Cretaceous. This resulted in greater supply of petrographically more-mature sand to the basin. Copyright ©2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Catchments; Chemical analysis; Geochronology; Offshore oil well production; Oxide minerals; Sedimentary rocks; Silicate minerals; Stratigraphy; Zircon; Atlantic Ocean; Clastic sediments; Early Cretaceous; Heavy minerals; Lower Cretaceous; Mesozoic sediments; Rutile and anatase; Subhedral grains; Titanium dioxide; catchment; clastic sediment; Cretaceous; drainage basin; geochronology; heavy metal; Jurassic-Cretaceous boundary; Mesozoic; Proterozoic; provenance; sedimentary rock; Atlantic Ocean; Canada; Georges Bank; Labrador Sea; Long Island [New York]; Maine; New Brunswick; New York [United States]; United States; Indicator minor; Trachytes
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125007
作者单位	Department of Geology, Saint Mary’s University, Halifax, NS, Canada; Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, Dartmouth, NS, Canada
推荐引用方式 GB/T 7714	Chavez I.,Pe-Piper G.,Piper D.J.W.,等. Late Mesozoic sediment provenance on Georges Bank: Enlargement of river drainages to the Atlantic Ocean in the Late Jurassic–Early Cretaceous[J],2019,103(6).
APA	Chavez I.,Pe-Piper G.,Piper D.J.W.,&Andrew MacRae R..(2019).Late Mesozoic sediment provenance on Georges Bank: Enlargement of river drainages to the Atlantic Ocean in the Late Jurassic–Early Cretaceous.AAPG Bulletin,103(6).
MLA	Chavez I.,et al."Late Mesozoic sediment provenance on Georges Bank: Enlargement of river drainages to the Atlantic Ocean in the Late Jurassic–Early Cretaceous".AAPG Bulletin 103.6(2019).