滇中姚安老街子板內(nèi)富堿火山巖鋯石SHRIMP U-Pb年代學及火山機構(gòu)劃分
[Abstract]:The alkali-rich volcanic-magmatic complex of Laojie sub-plate in central Yunnan is a part of the Ailaoshan-Jinshajiang alkali-rich intrusive rock belt, and has been widely concerned by geologists for its rich Pb-Ag-Au polymetallic deposits and special geotectonic locations. Although many previous studies have been carried out in ore deposit (state of occurrence and source of metals) petrology and geochemistry few studies have been carried out on volcanic mechanism petrography and age of formation of the Yao'an alkali-rich volcanic rock body. In this paper, detailed petrographic geological investigation and profile measurement of Laojie volcano-magmatic complex are carried out. The subvolcanic facies (containing syenite porphyry), the volcanic-sedimentary facies (tuffaceous conglomerate and sandstone) and the volcanic mechanism of volcanic eruption facies are distinguished. The volcanic eruption facies are subdivided into overflow subfacies (melt-bound tuff and pseudo-garnet trachyte) and explosive subfacies (breccia and agglomerate melt-deposited tuff). Zircon shrimp U-Pb dating of coarse surface tuff and fused tuff is carried out, and the weighted mean values of ~ (206) Pb / 238 U age are 33.63 鹵0.50 Ma and 33.27 鹵0.38 Ma, respectively, indicating that the volcanic eruption occurred in the Oligocene epoch. The report of volcanic rocks in this period provides a new idea for the prospecting and prediction of the deep periphery of the Pb-Ag-Au mining area in Laojie Zi, and also provides a new window for the study of the Cenozoic lithospheric tectonic evolution and geodynamic processes in the southeast margin of the Qinghai-Tibet Plateau.
【作者單位】: 昆明理工大學國土資源工程學院地球科學系;中國地質(zhì)科學院地質(zhì)研究所北京離子探針中心;
【基金】:北京離子探針中心開放基金(編號:DDC15-016) 云南省應用基礎研究計劃青年(編號:2016DF031) 國家重點基礎研究發(fā)展計劃(編號:2015CB452600、2015CB452605)項目聯(lián)合資助的成果
【分類號】:P588.14;P597.3
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