| 内蒙古贺兰山地区古元古代晚期的花岗岩浆事件及其地质意义: 同位素年代学的证据 |
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| 引用本文： | 耿元生.内蒙古贺兰山地区古元古代晚期的花岗岩浆事件及其地质意义: 同位素年代学的证据[J].岩石学报,2009,25(8):1830-1842. |
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| 作者姓名： | 耿元生 |
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| 作者单位： | 中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 国家自然科学基金项目，地质大调查项目 |
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| 摘 要： | 位于华北克拉通西缘的贺兰山杂岩主要由孔兹岩系和变形花岗岩(正片麻岩)所组成,前者主要由夕线石榴片麻岩、石榴二长片麻岩、变粒岩和少量的大理岩及麻粒岩所组成,后者主要包括黑云斜长片麻岩、石榴子石花岗岩、斑状花岗岩和片麻状变质闪长岩.本文报道了该区变形花岗岩的锆石SHRIMP U-Pb定年结果.黑云二长片麻岩和石榴子石花岗岩分别形成于2053±58Ma和2047±42Ma,斑状花岗岩和片麻状闪长岩分别在1955Ma和1920Ma侵位.大量的年代学资料表明,在华北克拉通北缘存在一条古元古代晚期的花岗杂岩带,该带中的花岗杂岩主要形成于三个阶段,第一阶段大于2.0Ga,第二阶段主要出现在2.0～1.87Ga期间,第三阶段的花岗杂岩在1.85～1.80Ga期间侵位.年代学研究还表明,古元古代晚期的花岗岩浆作用常常与变质事件紧密相关.
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| 关 键 词： | 古元古代晚期 贺兰山杂岩 花岗质岩 锆石SHRIMPU-Pb定年 华北克拉通北缘 |
| 收稿时间： | 1/7/2009 12:00:00 AM |
| 修稿时间： | 2009/3/21 0:00:00 |
Late-Paleoproterozoic granite events and their geological significance in Helanshan area, Inner Mongolia: Evidence from geochronology |
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| GENG YuanSheng.Late-Paleoproterozoic granite events and their geological significance in Helanshan area, Inner Mongolia: Evidence from geochronology[J].Acta Petrologica Sinica,2009,25(8):1830-1842. |
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| Authors: | GENG YuanSheng |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | Helanshan complex, situated in the western margin of the North China Craton, consists mainly of khondlite series and deformed granitoids (orthogneisses). The former is composed dominently of sillimanite-garnet gneiss, garnet two-feldspar gneiss, leptineite and a bit of marble and granulite, the later consists mainly of biotite plagioclase gneiss, garnet granite, porphyritic granite and gneissic diorite. By using the zircon SHRIMP U-Pb dating, the authors have been obtained some results for granitoids in this area. The biotite feldspar gneiss and garnet granite formed respectivelly 2053±58Ma and 2047±42Ma, respectively,porphyritic granite and gneissic diorite intruded at 1955Ma and 1920Ma respectively. A lot of geochronology data indicate that a Late-Paleoproterozoic granite zone distributes in the northern margin of the North China Craton. The Late-Paleoproterozoic granitoids formed in three stages, the granitoids of the first stage formed early than 2.0Ga, second stage occurred in 2.0~1.87Ga, the granitoids in third stage intruded at 1.85~1.80Ga. The Late-Paleoproterozoic granitoids in the Helanshan area formed mainly at first and second stage. In the north margin of the North China Craton, Late-Paleoproterozioc granite magmatism accompanied usually by regional metamorphism in time. |
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| Keywords: | Late-Paleoproterozoic Helanshan complex Granitoids Zircon SHRIMP U-Pb dating Northern margin of North China Craton |
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