The age and tectonic environment of the rhyolitic rocks on the western side of Wuyi Mountain, South China
The age and tectonic environment of the rhyolitic rocks on the western side of Wuyi Mountain, South China
复制标题
华南武夷山西侧流纹岩的时代及构造环境
DOI：
10.1007/s11430-008-0078-4
复制
发表时间：
2008-07
期刊：
影响因子：
--
通讯作者：
Jiang ShaoYong
中科院分区：
文献类型：
--
作者：
Wang YanBin;Shu LiangShu;Deng Ping;Yu JinHai;Jiang ShaoYong
在武夷山西侧兴宁-五华地区变质岩地质调查中，首次在粤东兴宁县荆南镇元古宙变质岩中发现了新元古代流纹岩和流纹岩杂砂岩。通过对流纹质岩石的岩石学、地球化学和年代学等方面的系统研究，探讨了流纹质岩石形成的构造环境和形成时代。靖南流纹岩与同时代杂砂岩互层，总厚度为60 m，两者显示出相似的褶皱和变质模式。变质流纹岩由基质和斑晶组成，斑晶包括透长石、正长石和具有明显波纹消光的石英;基质已重结晶为细粒长石、石英和绢云母集合体。变杂砂岩是由长石、正长石、石英、奥长石等多种矿物颗粒和粘土基质叠加而成。用于SHRIMP U-Pb分析的锆石颗粒呈浅棕色，自形或亚自形。测年结果表明，南岭地区存在两个年龄组，其中8粒自形锆石的年龄为972±8 Ma，其余7粒自形-次自形锆石的年龄为1097±11 Ma，均为上涌岩浆从较老岩石中捕获的，表明南岭地区存在晚中元古代基底。此外，还从一个圆形碎屑锆石中获得了一个古元古代年龄，为2035±11 Ma，表明华南地区曾发生过一次古元古代热事件。京南流纹岩的地球化学特征为高K_2O、中Al_2O_3，ACNK值为0.98-1.11，属高钾碱性系列。富REE、Rb、Th、Ce，亏损Ba、Sr、Eu、Ti、P、Nb-Ta，具中等Eu、Sr负异常。这些特征表明，景南火山岩具有与东南沿海酸性火山岩相似的大陆弧性质，即武夷西部可能发生过新元古代构造岩浆事件，导致高钾钙碱性花岗质岩浆喷发。
During the geological survey of the metamorphic rocks in Xingning-Wuhua region on the western side of Wuyi Mountain, South China, we discovered the Neoproterozoic rhyolite and rhyolitic greywacke for the first time that outcrop in the Proterozoic metamorphic rocks near Jingnan Town of Xingning County, eastern Guangdong Province. A systematic research on petrology, geochemistry and geochronology of rhyolitic rocks was conducted to understand their tectonic setting and formation age. The Jingnan rhyolite is interbedded with a coeval greywacke, with a total thickness of 60 m; both rhyolite and greywacke display a similar folding and metamorphic pattern. Meta-rhyolite consists of groundmass and phenocrystals including sanidine, orthoclase, and quartz with distinct undulose extinction; the groundmass has been re-crystallized into fine-grain feldspar, quartz and sericite aggregation. Meta-greywacke is composed of crystallinoclastic grains (sanidine, orthoclase, quartz and oligoclase) and clay groundmass. Zircon grains used for the SHRIMP U-Pb analysis are light brown-colored and euhedral or sub-euhedral. Dating data suggest two age groups; eight grains of magma-type zircon with an idiomorphic form yield an age of 972±8 Ma, and the other seven weakly corroded grains of zircon with euhedral to subeuhedral shape construct an average age of 1097±11 Ma, which were captured from older rocks by an uplifting magma, implying that a late Mesoproterozoic basement exists in the Nanling region. In addition, one Paleoproterozoic age, 2035±11 Ma, is obtained from a rounded detrital zircon, indicating that a Paleoproterozoic thermal event took place in the South China. Geochemically, the Jingnan rhyolitic rocks are characterized by high K2O content, intermediate Al2O3content, with the ACNK value 0.98–1.11, and belonging to high-K alkaline series. They are rich in ΣREE, Rb, Th and Ce, depleted in Ba, Sr, Eu, Ti, P and Nb-Ta, and with moderate negative Eu and Sr anomalies. These features indicate that the Jingnan volcanic rocks have an affinity of continental arc that is similar to those of acid volcanic rocks in the SE-China Coastal Region, in other words, a Neoproterozoic tectono-magma event might have taken place in the western Wuyi region, leading to an eruption of high-K calc-alkaline granitic magma.
登录
查看更多内容
影响因子：
3.8
作者：
Xiaolei Wang;Jincheng Zhou;J. Qiu;W. Zhang;Xiaoming Liu;G. Zhang
通讯作者：
Xiaolei Wang;Jincheng Zhou;J. Qiu;W. Zhang;Xiaoming Liu;G. Zhang
DOI：
10.1360/03yd0113
发表时间：
2004-08
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
L. Shu;P. Deng;Bin Wang;Zhengzhong Tan;Xinqi Yu;Yan Sun
通讯作者：
L. Shu;P. Deng;Bin Wang;Zhengzhong Tan;Xinqi Yu;Yan Sun
DOI：
10.1007/bf02878742
发表时间：
1998-11
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
L. Shu;Yan Sun;Dezi Wang;M. Faure;P. Monié;J. Charvet
通讯作者：
L. Shu;Yan Sun;Dezi Wang;M. Faure;P. Monié;J. Charvet
DOI：
10.1360/n032014-00046
发表时间：
2014-04
期刊：
--
影响因子：
--
作者：
Qiuquan Wang;Nannan Tang;Limin Yang
通讯作者：
Qiuquan Wang;Nannan Tang;Limin Yang
影响因子：
3.5
作者：
RICKWOOD, PC
通讯作者：
RICKWOOD, PC