GEOLOGY OF LAU BASIN IN THE SOUTHWEST PACIFIC OCEAN
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摘要: 劳海盆是西南太平洋的一个正在活动的边缘海之一,属于相对简单的洋内边缘海盆,一直以来被作为检验板块构造及海底扩张的一个理想地区。劳海盆的熔岩化学及岩石学的研究成果,对评价蛇绿岩套的源区及正常洋中脊背景中的洋壳模型具有非常重要的意义。此外,深入研究劳海盆出露的硫化物矿床的成因对现存于陆地上的古老类似矿床的勘探模型的建立扮演重要的作用。在系统阐述汤加弧-劳海盆系统的地质概况、构造地质学、岩石学及热液矿床研究进展的基础上,指出了劳海盆所存在的一些重要的科学问题,并指明了下一步研究的重点方向。利用2007年我国在执行环球考察第19航次期间所获得的岩石、硫化物样品,开展对劳海盆岩浆-构造-热液成矿系统的综合研究,有利于提高我国对边缘海盆的基础研究水平。Abstract: Lau basin, one of active marginal basins in Southwest Pacific, belongs to a relatively simple intra-ocean marginal basin, which has been regarded as an ideal place for testing the theories of plate tectonics and seafloor spreading. The conclusions achieved by studying on lava chemistry and petrology play a significant role in evaluating the origin of ophiolite and ocean crust model in normal mid-ocean ridge setting. In addition, further studying on the genesis of sulfide deposits outcropped in Lau basin is helpful to establishing a reasonable prospecting model for similar deposit in the continent. Based on reviewing geology, structural geology, petrology and hydrothermal deposits in the Tonga arc-Lau basin system, this paper points out some important scientific problems which need to be further solved, and proposes several key orientations for further study. That studying on the integrated tectonic-magmatic-hydrothermal system is helpful for us to improve China's basic research level about back-arc basin system by using rock and sulfide samples which were collected during the global expedition (Cruise ID:DY115-19) performed by China, and will make a greater contribution to Earth sciences.
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Key words:
- structural geology /
- petrology /
- hydrothemal deposit /
- Tonga arc-Lau basin system /
- Lau basin
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