| 北山泥盆纪碰撞造山火山－磨拉石地质构造及地球化学特征 |
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| 引用本文： | 左国朝,刘春燕,白万成,冯永忠.北山泥盆纪碰撞造山火山－磨拉石地质构造及地球化学特征[J].甘肃地质学报,1995(1). |
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| 作者姓名： | 左国朝 刘春燕 白万成 冯永忠 |
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| 作者单位： | 甘肃省地矿局地质科学研究所，北京大学地质系 |
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| 摘 要： | 本区早泥盆世旱山微大陆与塔里木板块的北山地体间发生对接，原洋区变为残留滨浅海区。中泥盆世该区形成中央断块山，相应南带的断陷山间洼地内形成陆相磨拉石堆积，北带与南蒙古洋毗邻，形成陆缘滨浅海火山－磨拉石沉积。经计算，中带造山隆起侵蚀速率为０．１５４ｍｍ／ａ。晚泥盆世火山岩显示弱碱性和深熔岩浆喷溢特点，表明陆壳演化尚未达到完全稳定的阶段。
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| 关 键 词： | 北山，泥盆纪，碰撞造山，火山－磨拉石，剥蚀速率，地球化学特征 |
VOLCANO-MOLASSE GEOLOGICAL STRUCTURE AND GEOCHEMICAL SIGNATRE IN DEVONIAN PERIOD COLLISION OROGENIC IN BEISHAN,GANSU-INMONGOLIA |
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| Zuo Guochao, Liu Chunyan, Bai Wancheng,Feng Yongzhong.VOLCANO-MOLASSE GEOLOGICAL STRUCTURE AND GEOCHEMICAL SIGNATRE IN DEVONIAN PERIOD COLLISION OROGENIC IN BEISHAN,GANSU-INMONGOLIA[J].Acta Geologica Gansu,1995(1). |
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| Authors: | Zuo Guochao Liu Chunyan Bai Wancheng Feng Yongzhong |
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| Abstract: | Hanshan microcontinent was connected with Beishan terrane of Tarim Plate in Early De-vonian,ur-ocean changed residual littoral nertic area. In Middle Devonian,the area formedcentral fault-block mountain and corresponding to the fault intermont depression in southzone formed continental molasse accumulation and in the north zone,which adjoined SouthMongol Ocean,formed pericontinental Iittoral nertic volcano-molasse deposit.Denudationvelocity of Middle Zone orogenic uplift was at 0.1 54 mm/a by calculation. Volcanic rockshown weak alkali and anatectic magma outpouring feature and that proved crust evolutionhad not to be completely stability yet. |
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| Keywords: | Beishan Devonian period Collision orogeny Volcano-Molasse Denudation velocity Geochemical signature |
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