| 华南花岗岩-火山岩成因研究的几个问题 |
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| 引用本文： | 徐夕生.华南花岗岩-火山岩成因研究的几个问题[J].高校地质学报,2008,14(3). |
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| 作者姓名： | 徐夕生 |
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| 作者单位： | 南京大学,成岩成矿作用国家重点实验室,地球科学系,南京,210093 |
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| 摘 要： | 华南花岗岩-火山岩具幕式多期次产出的特点,成因类型和形成过程错综复杂.与世界其它地区相比,华南花岗岩-火山岩演化及其成矿作用是有鲜明特色的.近半个世纪的研究,逐步认识了华南花岗岩-火山岩的多样性及其时空分布格架,初步认识到其多样性受控于不同的地壳基底物质成分、不同的构造动力学背景、不同的壳幔相互作用过程等因素.但由于华南地质的特殊性和复杂性,不少具体的成岩成矿物质来源、空间和构造背景,甚至基础地质理论问题有待解析.华南深部地质及围绕华南的构造边界条件对花岗岩-火山岩成因的制约是目前的研究薄弱环节.本文提出了与中-新生代地质有关的值得研究的几个问题,包括:(1)三条低Nd模式年龄带及A型花岗岩;(2)四条火山岩带及壳幔相互作用;(3)全岩Nd同位素和锆石Hf同位素示踪;(4)花岗岩构造地质.
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| 关 键 词： | 花岗岩 火山岩 壳幔相互作用 锆石Hf同位素 花岗岩构造 华南 |
Several Problems Worthy to be Noticed in the Research of Granites and Volcanic Rocks in SE China |
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| XU Xi-sheng.Several Problems Worthy to be Noticed in the Research of Granites and Volcanic Rocks in SE China[J].Geological Journal of China Universities,2008,14(3). |
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| Authors: | XU Xi-sheng |
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| Abstract: | Compared with those in other regions worldwide, the granites and volcanic rocks in southeast China show distinct characteristics of episodical occurrences, complex genetic types and formation processes, and close affinity with metallogeny. In the past 50 years, the diversities of granites and their temporal and spatial distributions have been gradually revealed. The diversities of the granites are due to different source rocks of crustal basement, different geodynamic settings and different degrees of crust- mantle interactions. Because of the speciality and complication, the source rocks for the granites, tectonic settings of magmatism and related basic goelogical problems have not been clarified. The weakness of previous research on the granites and volcanics in SE China includes their genetic constraints affected by deeper geology and tectonic geodynamics around. The suggested research subjects related with Mesozoic-Cenozoic geology in SE China in this paper include: (1) A-type granites in three lower Nd model age belts; (2) distribution of four volcanic belts and crust-mantle interactions; (3) whole-rock Nd isotopes and zircon Hf isotope tracing; (4) granite structure. |
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| Keywords: | granite volcanic rocks crust-mantle interaction zircon Hf isotopes granite structure SE China |
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