| 秦岭造山带秦岭杂岩研究中有关问题讨论 |
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| 引用本文： | 郭进京,李怀坤,陈志宏.秦岭造山带秦岭杂岩研究中有关问题讨论[J].地质调查与研究,2003,26(2):95-102. |
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| 作者姓名： | 郭进京 李怀坤 陈志宏 |
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| 作者单位： | 1. 天津城市建设学院,天津,300384
2. 天津地质矿产研究所,天津,300170 |
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| 基金项目： | 国土资源部科技项目 (2 0 0 0 30 5 )，国家自然科学基金项目 (4 0 0 32 0 10 -c) |
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| 摘 要： | 分布于北秦岭造山带南部，夹持于商丹断裂带与朱夏断裂带之间的秦岭杂岩是秦岭造山带中最古老的前寒武纪基底块体之一。它是秦岭造山带中前寒武纪地壳形成与演化的地质记录，经历了晚元古代以来多旋回俯冲碰撞造山作用过程中多期构造热事件的改造。包含了大量反映秦岭造山带形成与演化的动力学过程地质信忠。虽然前人对秦岭杂岩已经进行了广泛深入研究，发表了大量的研究论著，提出了许多新认识和新见解，如从原秦岭群中解体出松树沟蛇绿岩片、峡河山群、古深成花岗片麻岩体等I高压变质岩(榴辉岩，高压麻粒岩)的发现；多期变形与变质特征的认识等。但由于秦岭杂岩问题的复杂性，某些认识或问题仍有待进一步研究探讨。其中(1)松树沟蛇绿岩片是否真正蛇绿岩?松树沟超镁铁质岩体与其围岩变质镁铁质岩是否同时代?它们的构造变形与变质历史是否相同?(2)峡河山群组成、分布、时代、构造意义及其与秦岭群片麻岩的关系；(3)秦岭岩群的组成、主变质期和变形期昀时代及性质；(4)晋宁期花岗岩带形成的构造背景及动力学意义；(5)已有同位素测年数据确切的地质意义；(6)高压交质岩的分布、产出状态、与围岩的关系、时代、成因及构造意义是秦岭杂岩研究中的基本问题。文中对上述有关问题进行了简要讨论，提出了今后秦岭杂岩研究的重点应放在构造事件、变质热事件、岩浆事件及其相互关系研究和这些地质事件的精确的同位素测年工作上。
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| 关 键 词： | 秦岭造山带 秦岭杂岩 松树沟蛇绿岩 峡河山群 地质事件 同位素测年 |
| 文章编号： | 1672-4135(2003)02-95-08 |
Brief Review of the Study of Qinling Complex, Qinling Orogenic Belt |
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| GUO Jinjing ,LI Huai-kun ,CHEN Zhi-hong.Brief Review of the Study of Qinling Complex, Qinling Orogenic Belt[J].Geological Survey and Research,2003,26(2):95-102. |
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| Authors: | GUO Jinjing LI Huai-kun CHEN Zhi-hong |
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| Institution: | GUO Jinjing 1,LI Huai-kun 2,CHEN Zhi-hong 2 |
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| Abstract: | Although the extensive and intensive study on Qinling Complex has been made, and new discoveries and progress,for example, disintegration of Songshugou Ophiolite slice and Xiahe Group from Qinling Group, identification of ecologite high pressure granulite and paleogranitoid pluton, has been made,there exist many problerms which are still disputed and need further study because of the complexity of Qinling Complex itself. In this paper brief review on Qinling Complex study is made and it is suggested that the follwing problerms should be intensively studied and answered.These problerms include (1)whether the Songshugou ophiolite slice is really ophiolite? and whether Songshugou Ultrabasic Body(SUB) and metamorphosed basic rocks which circled the SUB have same age and tectonic-metamorphism history? (2)the composition, distibution,age of the Xiahe Group and relationship between the Xiahe Group and Qinling Group;(3)the composition, age of main metamorphism and defomation event and its tectonic setting;(4)the tectonic setting of development of the Jinningian granite belt and its geodynamic implication;(5)the reexamination of geological significance of the obtained isotopic age data;(6)the relation between high pressure metamorphic rocks and its host rocks in Qinling Complex and its age, tectonic implication. The detailed study on tectonic events,metamorphic events,magmatic events and their relations, in particular the precised dating of them would help us to understand the Qinling complex and Qinling orogenic belt. |
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| Keywords: | Qinling Orogenic Belt Qinling Complex Songshugou Ophiolite Xiahe Group geological events Isotopic dating |
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