Provenance and tectonic setting of the Quemoco sandstones in the North Qiangtang Basin, North Tibet: Evidence from geochemistry and detrital zircon geochronology

2017 ◽  
Vol 53 (4) ◽  
pp. 1465-1481 ◽  
Author(s):  
Zhongwei Wang ◽  
Jian Wang ◽  
Xiugen Fu ◽  
Xinglei Feng ◽  
Dong Wang ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Tectonic Setting ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
Qiangtang Basin ◽  
The North

scholarly journals Reconstructing drainage pathways in the North Atlantic during the Triassic utilizing heavy minerals, mineral chemistry, and detrital zircon geochronology

Geosphere ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 479-500
Author(s):  
Steven D. Andrews ◽  
Andrew Morton ◽  
Audrey Decou ◽  
Dirk Frei
Keyword(s):  
North Atlantic ◽  
Detrital Zircon ◽  
Heavy Minerals ◽  
Zircon Geochronology ◽  
Reservoir Prediction ◽  
Transport Pathways ◽  
Detrital Zircon Geochronology ◽  
Tethys Sea ◽  
The North ◽  
The North Atlantic

Abstract In this study, single-grain mineral geochemistry, detrital zircon geochronology, and conventional heavy-mineral analysis are used to elucidate sediment transport pathways that existed in the North Atlantic region during the Triassic. The presence of lateral and axial drainage systems is identified and their source regions are constrained. Axial systems are suggested to have likely delivered sediment sourced in East Greenland (Milne Land–Renland) as far south as the south Viking Graben (>800 km). Furthermore, the data highlight the existence of lateral systems issuing from Western Norway and the Shetland Platform as well as a major east-west–aligned drainage divide positioned adjacent to the Milne Land–Renland region. This divide separated the catchments that flowed north to the Boreal Ocean from those that flowed south into a series of endoreic basins and, ultimately, the Tethys Sea. A further potential drainage divide is identified to the west of Shetland. The data presented and the conclusions reached have major implications for reservoir prediction, as well as correlation, throughout the region. Furthermore, understanding the drainage networks that existed during the Triassic can help constrain paleogeographic reconstructions and provides an important framework for the construction of facies models in the region.

Detrital zircon geochronology and polycyclic sediment sources, Upper Jurassic – Lower Cretaceous of the Scotian Basin, southeastern Canada 1This article is one of a series of papers published in this CJES Special Issue on the theme of Mesozoic–Cenozoic geology of the Scotian Basin.

2012 ◽  
Vol 49 (12) ◽  
pp. 1540-1557 ◽  
Author(s):  
David J.W. Piper ◽  
Georgia Pe-Piper ◽  
Mike Tubrett ◽  
Stavros Triantafyllidis ◽  
Greg Strathdee
Keyword(s):  
Detrital Zircon ◽  
North Atlantic Ocean ◽  
Upper Jurassic ◽  
Sediment Provenance ◽  
Late Paleozoic ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
The North ◽  
Large Peak ◽  
Meguma Terrane

Sources of Tithonian–Albian sediment in the Scotian Basin are interpreted from detrital zircon geochronology to test previous hypotheses about the sources and pathways of sediment to thick deltaic successions that are important hydrocarbon reservoirs. Sediment provenance influences reservoir quality, but also provides information on tectonism during rifting of the North Atlantic Ocean. More than 760 zircons were dated by laser ablation U–Pb methods from nine offshore wells and one borehole on land and were characterized by external morphology, internal zoning, and Th/U ratio. A Meguma terrane source to the LaHave Platform was confirmed by peaks in detrital zircon abundance at 550–650 Ma, 1.0–1.2 Ga, and ∼2.1 Ga. Samples from the Sable Subbasin show a large peak in detrital zircon abundance at ∼1050 Ma, with lower peaks from 400–650, ∼1480, ∼1650, ∼1860 Ma and 2.7 Ga, characteristic of inboard Appalachian terranes of Laurentide affinity. Many late Paleozoic to Neoproterozoic zircons are euhedral or subhedral, and apparently first cycle, as are a few older zircons that indicate transport from the rising rift shoulder in southern Labrador as far north as the Makkovik Province (∼1860 Ma). About half the zircons are rounded and polycyclic. Samples from the Abenaki Subbasin are similar, but late Paleozoic to Neoproterozoic zircons are rare and ∼40% of the Mesoproterozoic zircons are subhedral, implying a different Laurentide source through the Humber valley. Euhedral–subhedral unzoned zircons yielded two groups of Cretaceous dates: ∼105 Ma from the Cree Member, and ∼120 Ma from the Missisauga Formation.

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