Detrital zircon U-Pb geochronology and provenance of Lower Cretaceous sediments: Constraints for the northwestern Sichuan pro-foreland basin

被引：20
作者：
Li, Yingqiang [1 ]
He, Dengfa [1 ]
Li, Di [1 ]
Wen, Zhu [1 ,2 ]
Mei, Qinghua [1 ,3 ]
Li, Chuanxin [1 ]
Sun, Yanpeng [1 ,4 ]
机构：
[1] China Univ Geosci, Key Lab Marine Reservoir Evolut & Hydrocarbon Acc, Minist Educ, Beijing 100083, Peoples R China
[2] Chongqing Inst Geol & Mineral Resources, Key Lab Shale Gas Explorat, Minist Land & Resources, Chongqing 400042, Peoples R China
[3] SINOPEC Explorat Co, Chengdu 610041, MA, Peoples R China
[4] Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA
来源：
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY | 2016年 / 453卷
基金：
中国国家自然科学基金;
关键词：
Tectonic setting; Collisional basin; South China Block; Yangtze Craton; Reactivation; Orogeny; GARZE FOLD BELT; EASTERN TIBETAN PLATEAU; QINLING OROGENIC BELT; NORTH CHINA CRATON; YANGTZE BLOCK CONSTRAINTS; HF ISOTOPIC CONSTRAINTS; SONGPAN-GANZI COMPLEX; HIGH-PRESSURE ROCKS; A-TYPE GRANITE; SOUTH CHINA;
D O I：
10.1016/j.palaeo.2016.03.030
中图分类号：
P9 [自然地理学];
学科分类号：
0705 ; 070501 ;
摘要：
Detrital zircons were recovered from several units within the Lower Cretaceous sedimentary cover of the northwestern Sichuan Basin, and dated using U-Pb geochronology to assess their provenance and depositional setting. Five major age populations were identified in the U-Pb age spectra: a Neoarchean to late Palaeoproterozoic group (composed of two distinct age populations at 2754-2151 and 2102-1627 Ma), a Neoproterozoic group (979-621 Ma), an Early Ordovician to Early Carboniferous group (478-326 Ma), an Early Permian to Late Triassic group (297-205 Ma), and an Early Jurassic to earliest Cretaceous group (188-138 Ma). Each of these age populations corresponds with one or several potential sources around the NWSB; the Neoarchean to late Palaeoproterozoic zircons are primarily derived from the South Qinling Belt, the northern Yangtze Craton, the Bikou terrane, and the Songpan-Ganzi terrane, with an additional contribution from the southwestern Yangtze craton in the Neoproterozoic. Recycling of sediments in the Songpan-Ganzi terrane and the South Qinling Belt may be the source of the Early Ordovician to Early Carboniferous zircon population. Early Permian to Late Triassic zircons are predominantly sourced from Triassic granitoids in the South Qinling Belt, as well as the Late Triassic Songpan-Ganzi turbidites during their eastward transportation. Recycling of Upper Jurassic to Lower Cretaceous sediments in the Qinling orogen most likely supplied the observed population of Jurassic to Early Cretaceous age zircons. Detrital zircon age distributions in Lower Cretaceous sediments record a pro-foreland basin setting characterized by intracontinental subduction. Oblique or tangential compression arising from clockwise rotation of the South China Block (SCB) served as an additional driver for the formation of the Cretaceous pro-foreland basin, and reactivation and inheritance may produce differentiation. (C) 2016 Elsevier B.V. All rights reserved.
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页码：52 / 72
页数：21
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