| 富锦隆起泥盆系与变质基底角度不整合关系的发现及构造意义 |
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| 引用本文： | 付秋林,张兴洲,曾振,蒲建彬.富锦隆起泥盆系与变质基底角度不整合关系的发现及构造意义[J].世界地质,2016,35(2):458-469. |
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| 作者姓名： | 付秋林 张兴洲 曾振 蒲建彬 |
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| 作者单位： | 吉林大学 地球科学学院，长春 130061 |
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| 摘 要： | 为了解富锦隆起的构造演化,研究了佳木斯地块东北部富锦隆起地区一套含砾粗砂岩-石英砂与花岗片麻岩不整合面。LA-ICP-MS锆石U-Pb年代学结果表明,花岗片麻岩的加权平均年龄为495±5 Ma,石英砂岩中的碎屑锆石年龄均480 Ma,其中以480~520 Ma的年龄组为主体,并含有少量年龄800 Ma的锆石。角度不整合及年代学证据充分表明,富锦隆起是佳木斯地块的组成部分。鉴于佳木斯地块缺失奥陶纪—志留纪沉积,推测这套含砾粗砂岩-石英砂岩的形成时代为泥盆纪。结合区域资料,认为佳木斯地块的变质结晶基底形成后,经历了长期的隆升剥蚀,到早泥盆世,其东部整体转为被动大陆边缘。
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| 关 键 词： | 富锦隆起 佳木斯地块 泥盆纪 变质结晶基底 角度不整合 |
Discovery and tectonic significance of unconformity in Devonian with its underlying metamorphic basement in Fujin uplift |
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| FU Qiu-Lin,ZHANG Xing-Zhou,ZENG Zhen,PU Jian-Bin.Discovery and tectonic significance of unconformity in Devonian with its underlying metamorphic basement in Fujin uplift[J].World Geology,2016,35(2):458-469. |
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| Authors: | FU Qiu-Lin ZHANG Xing-Zhou ZENG Zhen PU Jian-Bin |
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| Institution: | College of Earth Sciences，Jilin University，Changchun 130061，China |
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| Abstract: | In order to understand the tectonic evolution of Fujin uplift， the authors studied the unconformity of conglomeratic sandstone- quartz sandstone with its underlying granitic gneiss in Fujin uplift of northeastern Jiamusi Massif． Based on the LA－ICP－MS zircon dating， granitic gneiss weighted mean age is 495 ±5 Ma． The U－ Pb ages for zircons from quartz sandstone are all more than 480 Ma，of which are mainly concentrated in the age of 480 ～ 520 Ma，and just a small amount of ages are more than 800 Ma． The evidence of unconformity and geochronology indicates that the Fujin uplift is a part of Jiamusi Massif． Due to the Jiamusi Massif lacking of the Ordovician and Silurian sediments，it suggested that the forming time of the conglomeratic sandstones and quartz sandstone is Devo- nian． Combined with the regional research data，it is considered that after the formation of metamorphic crystalline basement，the Jiamusi Massif was undergone long- time uplift and erosion until Early Devonian，then the eastern part of the Massif was whole turning into passive continental margin． |
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| Keywords: | Fujin uplift Jiamusi Massif Devonian memetamorphic crystalline basement unconformity |
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