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Geochronological Framework of Paleoproterozoic Intrusive Rocks and Its Constraints on Tectonic Evolution of the Liao-Ji Belt, Sino-Korean Craton
Journal of Earth Science ( IF 3.3 ) Pub Date : 2021-03-04 , DOI: 10.1007/s12583-020-1367-x
Jingsheng Chen , Zhongzhu Yang , Dexin Tian , Dehe Xing , Lidong Zhang , Fan Yang , Bin Li , Miao Liu , Yi Shi , Chao Zhang

The Liao-Ji belt (LJB) is one of the Paleoproterozoic tectonic belts located in the North China Craton. A large number of Paleoproterozoic meta-volcanic-sedimentary rock and intrusive rocks are preserved in the LJB, which provide reliable carriers for the study of the Paleoproterozoic tectonic evolution of the North China Craton. The Paleoproterozoic intrusive rock in the LJB can be divided into the following seven types: syenogranite, quartz diorite, porphyry granite, migmatitic granite, syenite, metamorphic plutonic rock, and granitic pegmatite and metagabbro (metamorphic diabase). Zircon U-Pb dating of 15 samples from intrusive rocks was carried out in this study. The chronology framework of the Paleoproterozoic intrusive rock in the LJB was established, and the magmatism of intrusive rocks can be divided into three stages: 2 200 to 2 110, 2 010 to 1 937, 1 900 to 1 820 Ma. The chronological framework supported the evolution model of subduction accretionary arc-continent collision in the LJB effectively. Combined with previous geochemical work, it was a passive continental margin environment at approximately 2 200 Ma, and then transformed into and active continental margin. The bimodal intrusive rocks between 2 180 and 2 150 Ma indicated a back-arc tension environment which lasted until approximately 2 110 Ma with a large number of basic intrusive rocks. And then the back-arc basin began to contract and the magmatic activities were reduced, with only a small number of intrusive rock activities occurring at approximately 2 040, 2 010 and 1 937 Ma. After the orogenic activities, there was a post-orogenic extension stage from 1 900 to 1 820 Ma. Magmatic activities caused by the environmental extension started to occur more frequently and subsequently resulted in the large-scale intrusive rocks in eastern Liaoning.



中文翻译:

中韩克拉通辽纪地带古元古代侵入岩的年代学框架及其对构造演化的制约

辽集带(LJB)是位于华北克拉通的古元古代构造带之一。LJB保留有大量的古元古代中火山沉积岩和侵入岩,为华北克拉通古元古代构造演化的研究提供了可靠的载体。LJB中的古元古代侵入岩可分为以下7种类型:辉长花岗岩,石英闪长岩,斑岩花岗岩,多花岗花岗岩,正长岩,变质的深成岩,花岗伟晶岩和变辉岩(辉绿辉绿岩)。在这项研究中,对侵入岩中的15个样品进行了锆石U-Pb测年。建立了LJB古元古代侵入岩的年代学框架,并将侵入岩的岩浆作用分为三个阶段:2 200〜2 110,2010到1937 Ma,1900到1820 Ma。年代学框架有效地支持了LJB俯冲增生弧-大陆碰撞的演化模型。结合以前的地球化学工作,它是一个大约2 200 Ma的被动大陆边缘环境,然后转变为主动大陆边缘。在2 180和2 150 Ma之间的双峰侵入岩表明了一个弧后张力环境,该环境一直持续到大约2 110 Ma,并带有大量的基本侵入岩。然后弧后盆地开始收缩,岩浆活动减少,只有少量侵入岩活动发生在大约2040、2010和1937Ma。在造山活动之后,造山后扩张期从1900Ma增至1820Ma。

更新日期:2021-03-04
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