地质学

地质学

来源出版物：SCIENCE CHINA Earth Sciences，2015，58（7）： 1045-1069联系邮箱：ZHENG Yong-fei，yfzheng@ustc.edu.cn

哀牢山南段长安金矿地质特征及找矿方法研究

李华，王永华，张星培，等

长安金矿位于哀牢山成矿带南段，是该成矿带上新近发现的又一大型金矿床。该区为哀牢山地体边缘地壳增生带，主要由深变质岩系组成，区内构造断裂发育，对岩浆活动和成矿作用有显著影响。本文总结了长安金矿的地质特征，并以该区的控矿断裂F6为主要研究目标，以地层岩性电性特征作为约束条件，分别展开了磁法、激电、瞬变电磁和大地电磁等综合物探手段的试验研究。研究结果表明，磁法对于该矿找矿效果不明显，瞬变电磁和大地电磁测深反演的电阻率低阻体，准确界定了控矿断裂F6的位置、倾向、断距以及深部延伸情况，通过激电异常可大致判断矿体的位置。所以在长安金矿区下一步的深部隐伏矿勘查中，结合瞬变电磁、激电、大地电磁等地球物理方法，辅以土壤化探异常进行约束，可以达到快速有效找矿之目的。

哀牢山；长安金矿；EH-4；深部构造；瞬变电磁；激电

来源出版物：地质学报，2015，89（6）： 1085-1098

联系邮箱：李华，23841719@qq.com

封面介绍：The plate tectonics theory was originally developed from the study of continental drift，seafloor spreading and oceanic subduction，with little attention to continental tectonics. The discoveries of ultrahigh pressure metamorphic minerals in continental rocks resulted in the recognition that continental crust is subductable to mantle depths. More and more studies demonstrate that the plate tectonism may have generally evolved from oceanic subduction to continental collision，with some tectonic and geochemical inheritance from marginal tectonics to intracontinental tectonics. Intraplate magmatism may be viewed as post-subduction magmatism. Reworking of ancient and juvenile crustal rocks is a key to continental tectonics. For more details see review article by ZHENG YongFei et al. on pages 1045-1069.

Developing plate tectonics theory from oceanic subduction zones to collisional orogens

ZHENG Yong-fei，CHEN Yi-xiang，DAI Li-qun，et al.

Crustal subduction and continental collision is the core of plate tectonics theory. Understanding the formation and evolution of continental collision orogens is a key to develop the theory of plate tectonics. Different types of subduction zones have been categorized based on the nature of subducted crust. Two types of collisional orogens，i.e. arc-continent and continent-continent collisional orogens，have been recognized based on the nature of collisional blocks and the composition of derivative rocks. Arc-continent collisional orogens contain both ancient and juvenile crustal rocks，and reworking of those rocks at the post-collisional stage generates magmatic rocks with different geochemical compositions. If an orogen is built by collision between two relatively old continental blocks，post-collisional magmatic rocks are only derived from reworking of the old crustal rocks. Collisional orogens undergo reactivation and reworking at action of lithosphere extension，with inheritance not only in the tectonic regime but also in the geochemical compositions of reworked products（i.e.，magmatic rocks）. In order to unravel basic principles for the evolution of continental tectonics at the post-collisional stages，it is necessary to investigate the reworking of orogenic belts in the post-collisional regime，to recognize physicochemical differences in deep continental collision zones，and to understand petrogenetic links between the nature of subducted crust and post-collisional magmatic rocks. Afterwards we are in a position to build the systematics of continental tectonics and thus to developthe plate tectonics theory.

crustal subduction； continental collision； postcollisional reworking； magmatism； metamorphism； continental tectonics