| 新疆乌伦古河碱性花岗岩的地球化学及其构造意义 |
| |
| 引用本文： | 韩宝福,洪大卫.新疆乌伦古河碱性花岗岩的地球化学及其构造意义[J].地质科学,1994,29(4):373-383. |
| |
| 作者姓名： | 韩宝福 洪大卫 |
| |
| 作者单位： | 1. 北京大学地质学系 北京 100871;2. 中国地质科学院岩石图研究中心 北京 100037 |
| |
| 摘 要： | 在新疆北部准噶尔板块与阿尔泰造山带的缝合带即阿尔曼泰-扎河坝蛇绿混杂岩带附近,沿乌伦古河南岸分布一条碱性花岗岩带。它们形成的时代为292-309Ma,是阿尔泰地区海西期继同碰撞s型花岗岩类、碰撞后抬升Ⅰ型花岗岩类之后的最后一次岩浆活动的产物。这些碱性花岗岩以出现霓石、钠铁闪石、高硅、高碱、低钙、低镁、富集高场强元素为特征,属于典型的A型花岗岩。碱性花岗岩是海西期岩浆旋回的最后产物,活动时间很短暂,在空间上与蛇绿岩带伴生,为后造山A型碱性花岗岩(PA型),是阿尔泰海西期造山运动结束的重要标志。
|
| 关 键 词： | 碱性花岗岩 后造山 乌伦古河 新疆 |
| 收稿时间： | 1993-06-24 |
| 修稿时间： | 1993-06-24; |
GEOCHEMISTRY AND TECTONIC SIGNIFICANCE OF ALKALI GRANITES ALONG ULUNGUR RIVER, XINJIANG |
| |
| Wang Shiguang,Han Baofu,Hong Dawei,Xu Baoliang,Sun Yayun.GEOCHEMISTRY AND TECTONIC SIGNIFICANCE OF ALKALI GRANITES ALONG ULUNGUR RIVER, XINJIANG[J].Chinese Journal of Geology,1994,29(4):373-383. |
| |
| Authors: | Wang Shiguang Han Baofu Hong Dawei Xu Baoliang Sun Yayun |
| |
| Affiliation: | 1. Deparlment of Geology, Peking University, Beijing 100871;2. Lithosphere Research Center, Chinese Academy of Geological Sciences, Beijing 100037 |
| |
| Abstract: | In North Xinjiang, there is an alkali granite zone extended in NW-SE direction along the southern bank of Ulungur River and parallel to the suture zone, i.e.Aermantai-Zhaheba Ophiolitic Melange Zone, between Junggar Plate and Altay Orogenic Belt. The Rb-Sr isochron ages of these granites are in range of 292-309Ma, showing that they are generated by the latest Hercynian magmatism after the syncollisional S-type and postcollisional uplift I-type granitoids in Altay region. The lkali granite are mineralogically characterized by the occurence of aegirine and arfvedsonite and chemically by high silicon and alkali, low calcium and magnesium, and enrichment of HFS elements, being typical A-type granites. The alkali granites were formed in the late stage of the Hercynian cafe-alkaline magmatism cycle in a very short period.They are in line with postorogenic A-type alkali granites, marking the end of the Hercynian Orogeny in Altay region and implying that the tectonic regime was changed from compression to extension. |
| |
| Keywords: | Alkali granite Postorogeny Ulunguo River Xinjiang |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地质科学》浏览原始摘要信息 |
|
点击此处可从《地质科学》下载全文 |
|
