The late-Paleozoic mafic volcanic rocks occurring in the surrounding areas of the Gonghe basin are distributed in the A’nyêmaqên ophiolite zone, Zongwulong tectonic zone and Kuhai-Saishitang volcanic zone. The mafic volcanics in the A’nyêmaqên zone formed an ancient ridge-centered hotspot around the Majixueshan OIB, the Kuhai-Saishitang mafic rocks consist of E-MORB and continental rift basalts and the Zongwulong volcanic rocks are enriched N-MORB. The regionally low Nb/U and Ce/Pb ratios reflect the influence of the OIB material on the mafic magma source. From geochemistry, spatial distribution and tectonic relationship of the mafic rocks, an ancient triple-junction centered at the Majixueshan can be inferred. The existence of the Kuhai-Saishitang aulacogen may have provided a tectonic channel for the Majixueshan OIB materials metasomatizing the magma source for the Zongwulong rocks. The formation of the triple-junction and the rifting of the Zongwulong zone have separated the orogens and massifs in the region.
Delineation of phytoplankton communities in this study was based on: 1) cluster analysis by Preston's Equation (1962) and
2) analysis of the number of individuals. Results obtained by these two methods were very similar to that obtained in a previous
study (Fig. 1, Gu and Guo, 1982) based on analysis of the number of planktonic species of different ecological nature. Among
these three methods, that based on cluster analysis (by which some subcommunities could be recognized) proved to be the best.
Contribution No. 1841 from the Institute of Oceanology, Academia Sinica. 相似文献
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