GEOCHEMISTRY OF CENOZOIC VOLCANIC ROCKS FROM TENGCHONG, WESTERN YUNNAN
-
摘要: 腾冲新生代火山岩位于印度板块和欧亚板块碰撞带附近,但是喷发时大洋已经闭合,属于大陆板内火山岩。对其进行地球化学研究,可以用来划分构造属性和推测岩浆来源。采用XRF和ICP-MS对典型岩石样品进行了较系统的岩石地球化学研究,结果表明,岩石类型有玄武质粗面安山岩、粗面安山岩和玄武安山岩,属高钾钙碱性系列;岩石化学显示高K2O、CaO和低TiO2,Mg#较高,平均约为46;稀土元素分布呈右倾,显示明显的Eu负异常;相对于原始地幔富集大离子亲石元素和高场强元素,并具有明显的Th正异常;地球化学组成总体上与岛弧岩浆岩相似,推测其成因与印度板块向欧亚板块俯冲引发的岩浆活动有关。特征元素比值显示岩浆可能来源于与俯冲作用相关的EMⅠ型地幔。Abstract: Tengchong Cenozoic volcanic rocks, which consist of basaltic trachy-andesite, trachy-andesite, and basaltic andesite, belonging to the high-K and calc-alkaline series, are continental intraplate volcanic rocks erupted after the Tethys Ocean was closed. They are distributed near the collision zone of the Indian plate and the Eurasian plate. The geochemical features of the rocks can be used to define the tectonic properties and magma sources. The systematic geochemical study of the typical rock samples by XRF and ICP-MS shows that the rocks are characterized by high K2O, CaO, low TiO2, and high Mg # (averaging about 46). REE shows a LREE-enriched pattern with significantly negative Eu. Large ion lithophile elements (LILE) and high field strength elements (HFSE) are enriched compared to the primitive mantle, and the LILE have higher enrichment than the HFSE. Th shows a significantly positive anomaly. The geochemical composition of the studied volcanic rocks is similar to the volcanic arc magma, suggesting that the magmatic activity was triggered by the subduction of the Indian plate down to the Eurasian plate. Characteristic element ratios show that the magma may be derived from the subduction-related EMⅠmantle.
-
Key words:
- geochemistry /
- island arc /
- volcanic rocks /
- Cenozoic Era /
- Tengchong
-
-
[1] 周真恒,向才英. 腾冲火山岩同位素地球化学研究[J]. 地震研究, 2000, 2(2):194-200.
[ZHOU Zhenheng, XIANG Caiyin. Geochemistry of the isotopes in the volcanic rocks in Tengchong, China[J]. Journal of Seismologic Research, 2000, 2(2):194-200.]
[2] Ren Jianguo,Wang Xianbin,Ouyang Ziyua. Mantle-derived CO2 in hot springs of the Rehai geothermal Field, Tengchong, China[J]. Acta Geologica Sinica, 2005, 79(3):426-431.
[3] 陈廷方,赵崇贺. 腾冲新生代火山岩的构造环境分析[J]. 西南工学院报,1994, 9(4):52-59.
[CHEN Tingfang, ZHAO Chonghe. Discussion on the tectonic setting of the Tengfong Cenozoic volcanic rocks[J]. Journal of Southwest China Institute of Technology, 1994, 9(4):52-59.]
[4] 陈廷方,赵崇贺. 腾冲新生代火山岩群岩石化学和地球化学特征[J].西南工学院报,1995,10(4):102-108.
[CHEN Tingfang, ZHAO Chonghe. The petrochemistry and geochemistry characteristics of Cenozoic volcanic groups from Tengchong area[J]. Journal of Southwest China Institute of Technology, 1995,10(4):102-108.]
[5] 陈廷方. 一种新的构造岩浆类型——滞后型弧火山的特征[J]. 西南工学院报,1997,12(3):49-52.
[CHEN Tingfang. A new type of magma tectonic type-The characteristics of post collision arc volcanism[J]. Journal of Southwest China Institute of Technology,1997,12(3):49-52.]
[6] 陈廷方. 云南腾冲火山岩岩石学特征[J]. 沉积与特提斯地质,2003, 23(4):56-61.
[CHEN Tingfang. The petrology of the volcanic rocks in Tengchong, Yunnan[J]. Sedimentary Geology and Tethyan Geology,2003, 23(4):56-61.]
[7] Wang Fei, Peng Zicheng,Zhu Rixiang, et al. Petrogenesis and magma residence time of lavas from Tengchong volcanic field (China):Evidence from U Series disequilibria and 40Ar/39Ar dating[J]. Geochemistry Geophysics Geosystems, 2006,7(1):Q01002, doi:10.1029/2005 GC001023.
[8] Zou Haibo, Fan Qicheng, Axel K Schmitt, et al. U-Th dating of zircons from Holocene potassic and esites (Maanshan volcano, Tengchong, SE Tibetan plateau) by depth profiling:time scales and nature of magma storage[J]. Lithos, 2010, 118:202-210.
[9] 赵慈平. 腾冲火山区现代幔源氮释放特征及深部岩浆活动研究[D]. 中国地震局地质研究所博士学位论文, 2008.[ZHAO Ciping. Mantle-derived Helium release characteristics and deep magma charmber activities of Present day in the Tengchong[D]. Doctoral Dissertation from Institute of Geology of China Earthquake Administration,2008.]
[10] 王登红,应汉龙,梁华英,等. 西南三江地区新生代大陆动力学过程与大规模成矿[M]. 北京:地质出版社,2006:13-14.[WANG Denghong, YING Hanlong, LIANG Huaying, et al. Dynamics and Large-Scale Metallogenesis from Southwest Sanjiang Area Cenozoic Continental[M]. Beijing:Geological Press,2006:13
-14.]
[11] Wang Yu, Zhang Xuemin, Jiang Chaosong, et al. Tectonic controls on the late Miocene-Holocene volcanic eruptions of the Tengchong volcanic weld along the southeastern margin of the Tibetan plateau[J]. Journal of Asian Earth Sciences, 2007, 30:375-389.
[12] 穆治国,佟伟,Gamiss H C腾冲火山活动的时代和岩浆来源问题[J]. 地球物理学报,1987, 30(3):261-270.
[MU Zhiguo, TONG Wei,Gamiss H C. Times of volcanic activity and origin of Magma area, west Yunnan province[J]. Chinese Journal of Geophysics,1987, 30(3):261-270.]
[13] Le Maitre R W A. Classification of Igneous Rocks and Glossary of Terms[M]. Blackwell, Oxford, 1989:193.
[14] Peccerillo R, Taylor S R. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey[J]. Contrib. Mineral Petrol., 197658:63-81.
[15] Middlemost E A K. Magmas and Magmatic Rocks[M]. London:Longman, 1985.
[16] 迟清华,鄢明才.应用地球化学元素丰度数据手册[M].北京:地质出版社,2007:16.[CHI Qinghua, YAN Mingchai. Geochemical Rlement Abundance Data Handbook[M].Beijing:Geological Press,2007:16]
[17] Gao S, Rudnick R L, Yuan H L, et al. Recycling lower continental crust in the North China craton[J]. Nature, 2004, 432:892-897.
[18] Irvine T N, Barager W R A. A guide to the chemical classification of the common volcanic rocks[J]. Canadian Journal of Earth Sciences, 1971, 8:523-548.
[19] 刘燊,胡瑞忠,赵军红,等.鲁西青山组火山岩形成的构造背景及其成因探讨:主元素和微量元素证据[J].地球化学,2003,32(4):306-313.
[LIU Shen, HU Ruizhong, ZHAO Junhong, et al. Tectonic setting and petrogenesis of Qingshan Formation volcanic rocks in western Shandong province:Evidence from major elements and trace element[J].Geochemistry,2003,32(4):306-313.]
[20] Conly A G, Brenan J M, Bellon He, et al. Arc to rift transitional volcanism in the Santa Rosalia Region, Baja California Sur, Mexico[J]. Journal of Volcanology and Geothermal Research, 2005, 142:303-341.
[21] 韩吟文,马振东. 地球化学[M]. 北京:地质出版社,2003:33.[HAN Yinwen, MA Zhendong. Geochemistry[M]. Beijing:Geology Press,2003:33.]
[22] 刘丛强. 中国东部新生代玄武岩的地球化学——I.主元素和微量元素组成:岩石成因及源区特征[J].地球化学,1995,24(1):1-19.
[LIU Chongqiang. Geochemisty of Cenozoic basalts from eastern China——I:major element and trace element and compositions:petrogenesis and characteristics of mantle source[J]. Geochemistry, 1995,24(1):1-19.]
[23] 邱家骧.应用岩浆岩岩石学[M].武汉:中国地质大学出版社,1991:194-197.[QIU Jiaxiang. Application of Magmatic Rocks[M]. Wuhan:China University of Geosciences Press, 1991:194
-197.]
[24] 武莉娜,王志畅,汪云亮. 微量元素La,Nb,Zr在判别大地构造环境方面的应用[J].华东地质学院学报, 2003, 26(4):343-348.
[WU Linna, WANG Zhi Chang, WANG YunLiang. On the application of La, Nb and Zr in identifying the tectonic settings[J]. Journal of East China Geological Institute, 2003, 26(4):343-348.]
[25] 季建清,钟大赉,陈昌勇. 滇西南那邦变质基性岩地球化学与俯冲板片裂离[J].岩石学报,2000, 16(3):433-442.
[JI Jianqing, ZHONG Dalai, CHEN Changyong. Geochemistry and genes of Nabang metamorphic basalt, Southwest Yunnan, China implications for the slab break-off[J]. Acta Petrologica Sinica,2000,16(3):433-442.]
[26] 李海勇,徐兆文,陆现彩,等. 鲁西邹平盆地中生代火山岩的演化:对地幔源区的约束[J].岩石学报,2008,24(11):2537-2547.
[LI Haiyong, XU Zhaowen, LU Xianchai,et al. Evolution of Mesozoic volcanic rocks in the Zouping Basin, western Shandong province:constraints for mantle source[J]. Acta Petrologica Sinica, 2008, 24(11):2537-2547.]
[27] 李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992:118.[LI Changnian. Trace Elements of Igneous Rock[M]. Wuhan:China University of Geosciences Press,1992:118.]
[28] 周刚,秦纪华,张招崇,等. 新疆富蕴县苏普特一带双峰式火山岩的发现及其地质意义[J].地质评论,2007,53(3):337-348.
[ZHOU Gang, QIN Jihua, ZHANG Zhaochong, et al. The discovery of bimodal volcanic in Supute area of Fuyun County, Xinjiang, and its geological significance[J]. Geological Review,2007,53(3):337-348.]
-
计量
- 文章访问数: 1360
- PDF下载数: 3
- 施引文献: 0
下载: