The discovery of Early Jurassic volcanic rocks along the Southern Lancangjiang tectonic magmatic belt in southwest Yunnan, with a discussion on the upper limit of Indosinian tectonic cycles in Yunnan Province
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摘要:
采用锆石激光剥蚀法（LA-ICP-MS）对滇西南南澜沧江火山岩带普洱市江桥—那澜一带的流纹岩进行了年代测定，获得了（196.7±2.3）Ma、（198.1±3.5）Ma的同位素年龄；表明该地区的流纹岩形成于早侏罗世，而非前人划分的晚三叠世，填补了该地区早侏罗世的火山-沉积记录。从岩石的主元素、稀土元素及微量元素资料分析，南澜沧江构造岩浆岩带早侏罗世的火山岩形成于碰撞后的伸展构造背景，可能与西侧昌宁—孟连古特提斯洋盆关闭后，俯冲岩石圈板片或造山带山根的拆沉作用相关，属后碰撞—后造山阶段岩浆活动的产物。具有典型后造山花岗岩或“A”型花岗岩的特征，其指示了印支构造旋回在滇西南地区最终结束的时间上限。
Abstract:The ages of rhyodacite in Jiangqiao-Nalan area of Pu'er City was determined by utilization of zircon-LA-ICP-MS in south Lancangjiang zone, and the result of U-Pb dating yielded (196.7±2.3)Ma and (198.1±3.5)Ma, which indicates that rhyolite in this area was formed in early Jurassic instead of in Late Triassic. The data fill in the record of volcanic-sedimentary activity in Jurassic's geological history. The analysis of the major elements, REE and trace elements of rocks shows that the volcanic rocks of lower Jurassic in South Lancangjiang zone were formed under the extensional tectonic background after collision, and were probably related to the subducted lithosphere plates or orogenic belt of Yamane delamination, and that they occurred after the closure of lower Cretaceous in this area were typically associated with the POG (post-orogenic granite) or A2 granite. These data constrain the final time of Indosinian cycle. The granite has the feature of post-orogenic granite or "A" type granite, and it indicates the termination time of Indo-Chinese cycle in southwestern Yunnan.
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图 5 江桥地区流纹岩(a)TAS图解（据Irvine et al., 1971；Middlemost, 1994）和(b)SiO2-K2O图解（底图据Rickwood, 1989）
Figure 5.
图 6 江桥地区流纹岩主量元素Harker图解（底图据Harker, 1909）
Figure 6.
图 7 江桥地区流纹岩岩石稀土元素球粒陨石标准化配分图（a）(球粒陨石数据值据Boynton, 1984)和微量元素原始地幔标准化蛛网图（b）(原始地幔数据值据Sun et al., 1989)
Figure 7.
图 8 江桥地区流纹岩CaO/(MgO+TFeO)-Al2O3/(MgO+TFeO)图解（底图据Altherr et al., 2000）
Figure 8.
图 9 江桥地区流纹岩主量元素与微量元素构造环境判别图（底图据Maniar et al., 1989；Pearce, 1996）
Figure 9.
图 10 江桥地区流纹岩R1-R2构造环境判别图解(据Batchelor et al., 1985)
Figure 10.
表 3 江桥地区流纹岩微量和稀土元素成分（10-6）
Table 3. Trace and rare element (10-6) content of rhyodacite in Jiangqiao area
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