大兴安岭红山子盆地火山岩系岩石地层对比

J4 ›› 2013, Vol. 19 ›› Issue (3): 472-.

• 构造地质·地球物理学 • 上一篇下一篇

大兴安岭红山子盆地火山岩系岩石地层对比

巫建华¹，武王君²，祝洪涛³，郭国林¹，吴仁贵²，刘帅¹，余达淦¹

1. 核资源与环境国家重点实验室培育基地（东华理工大学），南昌 330013；
2. 东华理工大学地球科学学院，抚州 344000；3. 核工业243地质大队，赤峰 024006

出版日期:2013-09-20 发布日期:2013-09-29
作者简介:：巫建华，1960年生，男，博士，教授，从事火山地质学与铀矿地质学研究；E-mail: jhwu@ecit.cn
基金资助:
中国核工业总公司项目《中国中-新生代铀成矿作用研究》（中核地计［2008］74号）

Lithostratigraphical Correlation of the Volcanic Rock Series in Hongshanzi Basin in Great Hingan Range

Online:2013-09-20 Published:2013-09-29

摘要/Abstract

摘要：

针对大兴安岭南部中生代火山岩系岩石地层单位存在的时间跨度大、不同岩石地层单位时代重叠的问题，选择红山
子盆地火山岩进行SHRIMP 锆石U-Pb 测年，并结合其它地区已有的锆石U-Pb 年龄数据和岩石组合特征对比火山岩系岩石
地层。红山子盆地2 个碱性流纹岩样品（HS505 和HS102）和1 个高钾钙碱性流纹岩样品（HS601）所含锆石均具有明显的
振荡环带，Th/U比值高，属典型的岩浆成因锆石。SHRIMP 锆石U-Pb 测年结果表明，样品HS601 的10 个分析点的206Pb/238U
年龄变化范围为150~160 Ma，加权平均值为（156.5±1.6）Ma，MSWD=1.11；样品HS102 的11 个分析点的206Pb/238U 年龄范
围为153~159 Ma，加权平均值为（154.7±1.7）Ma，MSWD=0.77；样品HS505 的14 个分析点的206Pb/238U 年龄变化范围为
151~160 Ma，加权平均值为（156.5±1.4）Ma，MSWD=1.16。可见，红山子盆地火山岩的年龄范围为157~155 Ma，属晚侏
罗世早期。红山子盆地火山岩以高钾钙碱性流纹岩- 碱性流纹岩组合为特征，与新民组的岩石组合特征基本一致，且层位
相当，应归入新民组。大兴安岭南部地区原划归满克头鄂博组和玛尼吐组、但地质时代属晚侏罗世的长英质火山岩组合应
改归新民组，修正后的新民组与冀北—辽西髫髻山组或蓝旗组和大兴安岭北部塔木兰沟组铁镁质火山岩组合的地质时代一
致，显示出中国东北部晚侏罗世火山岩组合具有南北分带性。

关键词: ：新民组；SHRIMP锆石U-Pb年龄；晚侏罗世早期；岩石地层对比；大兴安岭南部

Abstract:

Because of the large time span and the age overlap of the lithostratigraphic units of Mesozoic volcanic rocks in southern
Great Hingan Range, we have chosen volcanic rocks from Hongshanzi Basin to measure the SHRIMP zircon U-Pb age, together
with the zircon U-Pb age of the volcanic rocks from adjacent area and the characteristics of rock associations to correlate the
volcanic rock series . The zircon in two alkaline rhyolite samples (sample numbers HS505, HS102) and one high-k calc-alkaline
rhyolite samples (sample numbers HS601) from Hongshanzi Basin has obvious oscillatory ring, high Th/U ratio, and they belong
to typical magma genesis. The results of zircon U-Pb dating indicate that the ²⁰⁶Pb/²³⁸U age range of 10 analysis points of sample
HS601 is 150~160 Ma with the weighted average of 156.5±1.6 Ma and MSWD of 1.11. Eleven analysis points of sample
HS102 is 153~159 Ma with the weighted average of 154.7±1.7 Ma and MSWD of 0.77. Fourteen analysis points of samples
HS505 is 151~160 Ma with the weighted average of 156.5±1.4 Ma and MSWD of 1.16. The age range of the volcanic rocks
from Hongshanzi Basin is 157~155 Ma, which belongs to the early Late Jurassic. The volcanic rocks in Hongshanzi Basin show characteristics of high-k calc-alkaline rhyolite-alkaline rhyolite associations, which are similar to those of the Xinmin Formation.
The volcanic rocks are also stratigraphically correlatable. Therefore, the volcanic rocks should belong to the Xinmin Formation.
The Late Jurassic felsic volcanic rocks in southern Great Hingan Range, which was previously assigned to Manketouerbo
Formation and Manitu Formation, should belong to the Xinmin Formation, and the age of the revised Xinmin Formation is similar
to that of mafic volcanic rocks of Tiaojishan Formation or Lanqi Formation in northern Hebei-western Liaoning and Tamulan
Formation in northern Great Hingan Range, showing two zones, northerly and southerly, of rock association of the Late Jurassic
volcanic rock in Northeast China.

Key words: Xinmin Formation, SHRIMP zircon U-Pb age, early Late Jurassic, lithostratigraphical correlation, southern Great Hingan Range

巫建华，武王君，祝洪涛，郭国林，吴仁贵，刘帅，余达淦. 大兴安岭红山子盆地火山岩系岩石地层对比[J]. J4, 2013, 19(3): 472-.

大兴安岭红山子盆地火山岩系岩石地层对比

Lithostratigraphical Correlation of the Volcanic Rock Series in Hongshanzi Basin in Great Hingan Range

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