Chronology and geological implication of the Palco-Mesoproterozoic alkaline-rich intrusions belt from the northern part in the North China Craton.

本文报道华北克拉通北部燕辽三叉裂堑系和辽-吉拗拉谷内一系列古-中元古代富碱侵入岩的锆石U-Pb年龄。这些岩体整体呈近东西向分布,与该地区同期发育的其他非造山球斑花岗岩、斜长岩和大红裕组火山岩都形成于拉张性构造环境,并构成了一条长近千公里的迄今国内外最古老的富碱侵入岩带。该富碱侵入岩带具有东部较老(＞1．8Ga)和西部年轻(1．7Ga左右)的特点,它提供了华北克拉通在1．85～1．70Ga期间处于裂解构造格局的最好证据,丰富了全球性前寒武纪超大陆裂解的研究内容。U-Pb age data on zircons is reported for the Paleo-Mesoproterozoic alkaline-rich intrusions respectively in the Yan-Liao triple-junction aulacogen system and in the Liao-Ji aulacogen of the North China Craton (NCC). These intrusives, which are approximately distributed along east-west direction, together with other anorogenic rocks in the same period, such as rapakivi granites, anorthosite and the Dahongyu formation volcanic rocks, are formed in the extensional tectonic settings. These alkaline-rich intrusions are distributed near 1000km in length and form an oldest alkaline-rich intrusion belt so far reported in the world. The belt is characteristed by older rocks (> 1.8Ga) in east end of the belt than those in west end (about 1.7Ga). The Paleo-Mesoproterozoic alkaline-rich intrusion belt is an excellent example to indicate that the Northern part of the NCC was under extending rift system during 1.85 similar to 1.70Ga, and also provide a new information for study on Precambrian supercontinent breakup.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000236152700010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)2202377-3862