[1]黄长煌.福建长乐—南澳断裂带南务里变质岩碎屑锆石U-Pb年代学及其地质意义[J].华东地质,2018,39(03):169-176.[doi:10.16788/j.hddz.32-1865/P.2018.03.002]
　HUANG Chang-huang.Detrital zircon U-Pb ages of the Nanwuli metamorphic rocks in the Changle-Nan’ao fault zone, Fujian and their geological significance[J].East China Geology,2018,39(03):169-176.[doi:10.16788/j.hddz.32-1865/P.2018.03.002]
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福建长乐—南澳断裂带南务里变质岩碎屑锆石U-Pb年代学及其地质意义()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
39
期数:
2018年03期
页码:
169-176
栏目:
基础地质
出版日期:
2018-09-15

文章信息/Info

Title:
Detrital zircon U-Pb ages of the Nanwuli metamorphic rocks in the Changle-Nan’ao fault zone, Fujian and their geological significance
文章编号:
2096-1871(2018)03-169-08
作者:
黄长煌
(福建省地质调查研究院,福州 350013)
Author(s):
HUANG Chang-huang
(Fujian Institute of Geological Survey, Fuzhou 350013,China)
关键词:
亲营山组;  早侏罗世;  LA-ICP-MS锆石U-Pb定年;  南务里变质岩;  福建
Keywords:
Qinyingshan Formation;  Early Cretaceous;  LA-ICP-MS zircon U-Pb dating;  Nanwuli metamorphic rock;  Fujian
分类号:
P588.3
DOI:
10.16788/j.hddz.32-1865/P.2018.03.002
文献标志码:
A
摘要:
福建南务里变质岩位于长乐—南澳断裂带北段,主要由矽线石二云母石英片岩和矽线石黑云母石英片岩组成,超覆于片麻状花岗岩之上。岩石学特征表明:南务里变质岩的原岩为陆源碎屑岩。 LA-ICP-MS锆石U-Pb年龄谱出现2个峰值:第一峰值为189.6±5.7 Ma,206Pb/238U年龄集中于199～182 Ma; 第二峰值为1 899±4 Ma,207Pb/206Pb年龄集中于1 922～1 831 Ma。前者锆石自形晶较好,环带明显,Th/U值为0.4～0.96,稀土元素明显分异,属于岩浆锆石; 后者锆石磨圆度较高,环带不明显,Th/U值为0.03～0.3,稀土元素分异不明显,属于变质锆石; 部分为岩浆锆石,Th/U值>0.3,稀土元素分异明显。189.6±5.7 Ma代表该区变质岩原岩的沉积时代,原岩层位相当于早侏罗世梨山组。
Abstract:
The Nanwuli metamorphic rocks, located in the northern part of the Changle-Nan’ao fault zone of Fujian Province, consist mainly of sillimanite mica-quartz schist and sillimanite biotite quartz schist and overlay gneissic granite. Petrological characteristics indicate that the Nanwuli metamorphic rocks sourced from terrigenous clastic rocks. LA-ICP-MS zircon U-Pb age spectrum shows two peaks: the first peak is 189.6±5.7 Ma with a 206Pb/238U age range of 199～182 Ma, and the second is 1 899±4 Ma with a 207Pb/206Pb age range of 1 922～1 831 Ma. The former zircons(Early Jurassic zircons)are euhedral crystals with obvious oscillatory zonal texture of magmatic zircons and have Th/U ratios of 0.4～0.96 and distinct REE differentiation. As to the latter(Paleoproterozoic zircons), most of them show better psephicity with no obvious oscillatory zonal texture, have lower Th/U ratios(0.03～0.3)and weak REE differentiation, revealing that they derived from metamorphic rocks. A few Paleoproterozoic magmatic zircons have higher Th/U ratios(>0.3)and obvious REE differentiation, indicating that they might derive from old igneous rocks in the Cathaysia Block. The age of 189.6±5.7 Ma represents the sedimentary time(Early Jurassic)of the Nanwuli metamorphic rocks with its protolith equivalent to the early Jurassic Qingyingshan Formation.

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相似文献/References:

[1]黄长煌.福建龙海深澳变质岩锆石U-Pb同位素年代学及地质意义[J].华东地质,2016,37(01):28.[doi:10.16788/j.hddz.32-1865/P.2016.01.004]
　HUANG Chang-huang.Zircon U-Pb isotopic geochronology of metamorphic rocks in the Sheng’ao area, Longhai, Fujian Province and its geological significance[J].East China Geology,2016,37(03):28.[doi:10.16788/j.hddz.32-1865/P.2016.01.004]

备注/Memo

备注/Memo:
*收稿日期:2017-04-26 修订日期:2017-09-08 责任编辑:谭桂丽
基金项目:中国地质调查局“闽台中生代构造岩浆区区域地质专项调查(编号:12120114043301)”和福建省国土资源厅“台湾海峡西部盆地油气资源调查与评价(编号:闽财指[2015]700号)”项目联合资助。
作者简介:黄长煌,1962年生,男,高级工程师,主要从事区域地质调查与矿产地质调查研究。
更新日期/Last Update: 2018-09-26