广东从化石岭碱性杂岩体角闪石正长岩LA-ICP-MS锆石U-Pb定年
LA-ICP-MS Zircon U-Pb Dating of Hornblende Syenite form Shiling Alkaline Complex, Conghua City, Guangdong Province
DOI: 10.12677/AG.2015.52004, PDF, HTML, XML, 下载: 2,633  浏览: 10,516  国家科技经费支持
作者: 李宏卫, 林小明, 黄建桦：广东省地质调查院，广东 广州
关键词: 从化市；碱性杂岩体；角闪石正长岩；LA-ICP-MS锆石U-Pb定年；Conghua City； Alkaline Complex； Hornblende Syenite； LA-ICP-MS Zircon U-Pb Dating
摘要: 广东从化石岭碱性杂岩体呈东西向展布，出露面积约9 km2，属于南岭近东西向构造——岩浆岩带之佛冈岩浆岩带，岩体主要由角闪石正长岩和方钠石正长岩组成，是省内发现的唯一的碱性侵入岩体，该区也是广东乃至华南地区重要的正长岩非金属矿产地。对石岭碱性杂岩体角闪石正长岩进行LA-ICP-MS锆石U-Pb定年，获得其结晶年龄为125.3 ± 3.5 Ma (MSWD = 2.6, n = 13)，为早白垩世岩浆活动的产物。其成岩作用与早白垩世岩石圈强烈伸展构造背景下的地幔物质上涌密切相关。该年龄指示从化地区岩石圈发生伸展作用的时间为早白垩世。
Abstract: The Shiling alkaline complex in Conghua city, Guangdong province, extending from east to west, with about 9 km2 exposed area, belongs to the Fogang magmatite belt, which is one of the three nearly EW trending Tectonic and Magmatite Belt in Nanling area. It is mainly composed of hornblende syenite and sodalite syenite, is the only found alkaline intrusive rock mass in Guang-dong province, and this area is an important syenite non-metallic mineral deposits in Guangdong and even Southern China. The LA-ICP-MS zircon U-Pb age of hornblende syenite from Shiling alka-line complex is 125.3 ± 3.5 Ma (MSWD = 2.6, n = 13), and it shows the emplacement age of Shiling alkaline complex belonged to the early Cretaceous. The diagenesis is closely related to the mantle upwelling in strong lithospheric extensional tectonic background in early Cretaceous. The isotopic age with high precision indicates that the time of lithospheric extension in Conghua area was early Cretaceous.
文章引用：李宏卫, 林小明, 黄建桦. 广东从化石岭碱性杂岩体角闪石正长岩LA-ICP-MS锆石U-Pb定年[J]. 地球科学前沿, 2015, 5(2): 27-32. http://dx.doi.org/10.12677/AG.2015.52004

参考文献

[1] 周玲棣, 赵振华, 周国富 (1996) 我国一些碱性岩的同位素年代学研究. 地球化学, 2, 162-171.
[2] 刘昌实, 陈小明, 王汝成 (2003) 广东从化石岭方钠石正长岩特征及其起源. 地质论评, 1, 29-39.
[3] 广东省地质矿产局 (1988) 广东省区域地质志. 地质出版社, 北京.
[4] 肖振宇, 汪礼明, 杨学明 (1998) 广东从化石岭碱性杂岩的岩石学特征及其地质意义. 高校地质学报, 3, 133-138.
[5] Liu, Y.S., Hu, Z.C., Gao, S., Günther, D., Xu, J., Gao, C.G. and Chen, H.H. (2008) In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard. Chemical Geology, 257, 34-43.
[6] Wiedenbeck, M., Alle, P., Corfu, F., Griffin, W.L., Meier, M., Oberli, F., Quadt, A.V., Roddick, J.C. and Spiegel, W. (1995) Three natural zircon standards for U-Th-Pb, Lu-Hf, trace element and REE analyses. Geostandards and Geoanalytical Research, 19, 1-23.
[7] Sláma, J., Kosler, J., Condon, D.J., Crowley, J.L., Gerdes, A., Hanchar, J.M., Horstwood, M.S.A., Morris, G.A., Nasdala, L., Norberg, N., Schaltegger, U., Schoene, B., Tubrett, M.N. and Whitehouse, M.J. (2008) Plesovice zircon—A new natural reference material for U-Pb and Hf isotopic microanalysis. Chemical Geology, 249, 1235.
[8] Ludwig, K.R. (2003) ISOPLOT 3.00: A geochronological toolkit for microsoft excel. Berkeley Geochronology Center, Berkeley.
[9] Andersen, T. (2002) Correction of common lead in U-Pb analyses that do not report 204Pb. Chemical Geology, 192, 59-79.
[10] 刘昌实, 陈小明, 王汝成 (2002) 广东从化石岭方钠石正长岩矿物学特征及成因. 矿物学报, 3, 261-269.
[11] 包志伟, 赵振华, 熊小林 (2000) 广东恶鸡脑碱性正长岩的地球化学及其地球动力学意义. 地球化学, 5, 462- 468.
[12] Zindler, A. and Hart, S. (1986) Chemical geodynamics. Annual Review of Earth and Planetary Sciences, 14, 493-571.
[13] 赵子杰, 马大锉, 林惠坤 (1986) 广东龙窝、佛冈花岗岩体地球化学及其地质背景. 武汉地质学院出版社, 武汉.
[14] Zhou, X.M. and Li, W.X. (2000) Origin of late Mesozoic igneous rocks in southeastern China: Implication for lithosphere subduction and underplating of mafic magma. Tectonophysics, 326, 269-287.
[15] Li, X. (2000) Cretaceous magmatism and lithospheric extension in southeast China. Journal of Asian Earth Sciences, 18, 293-305.
[16] 陈培荣, 周新民, 张文兰, 李惠民, 范春方, 孙涛, 等 (2004) 南岭东段燕山早期正长岩——花岗岩杂岩的成因和意义. 中国科学：D辑：地球科学, 6, 493-503.
[17] 陈志刚, 李献华, 李武显 (2002) 全南正长岩的地球化学特征及成因. 地质论评, S1, 77-83.
[18] 刘昌实, 陈小明, 王汝成, 胡欢 (2003) 广东龙口南昆山铝质A-型花岗岩的成因. 岩石矿物学杂志, 1, 1-10.