马里亚纳南部弧内坡橄榄岩的岩石学及地球化学特征: 对弧前地幔流体交代作用的指示*

doi:10.11978/j.issn.1009-5470.2012.03.016

热带海洋学报 ›› 2012, Vol. 31 ›› Issue (3): 120-127.doi: 10.11978/j.issn.1009-5470.2012.03.016cstr: 32234.14.j.issn.1009-5470.2012.03.016

马里亚纳南部弧内坡橄榄岩的岩石学及地球化学特征: 对弧前地幔流体交代作用的指示*

董彦辉, 初凤友, 朱继浩, 余星

国家海洋局海底科学重点实验室, 国家海洋局第二海洋研究所, 浙江杭州 310012

收稿日期:2010-12-20 修回日期:2011-05-11 出版日期:2012-09-11 发布日期:2012-09-11
作者简介:董彦辉(1983—), 男, 山西省泽州县人, 助理研究员, 博士, 主要的研究方向为海底资源与成矿。
* 感谢日本海洋技术开发机构的石井辉秋为本研究提供宝贵的岩石样品以及相关航次资料。
基金资助:
国家自然科学基金青年基金项目(批准号: 40906037); 国家海洋局第二海洋研究所基本科研业务费项目(JG0901、JT1001); 海洋公益性行业科研专项(201005003)

Petrology and geochemistry of peridotite dredged from inner slope of Southern Mariana Trench: implication for mantle fluid metasomatism in the forearc setting

DONG Yan-hui, CHU Feng-you, ZHU Ji-hao, YU Xing

Key Laboratory of Submarine Geosciences, State Oceanic Administrtion, The Second Institute of Oceanography, State Oceanic Administrtion, Hangzhou 310012, China

Received:2010-12-20 Revised:2011-05-11 Online:2012-09-11 Published:2012-09-11

摘要/Abstract

摘要： 马里亚纳俯冲带弧内坡由于俯冲的太平洋板片的侵蚀而出露了相当于弧下地幔成分的橄榄岩, 这些橄榄岩是研究岛弧岩浆作用及弧下地幔流体交代作用难得的样品。报道了马里亚纳南部关岛以南的弧内坡橄榄岩的矿物组成、主量元素以及微量元素地球化学特征。这些岩石具有非常难熔的矿物组成: 橄榄石具有很高的Mg, 斜方辉石中的Al2O3含量极低, 尖晶石具有很高的Cr。滑石、蛇纹石和角闪石(透闪石为主, 有少量镁角闪石和浅闪石)则指示了流体在中低温度下对橄榄岩的交代作用, 并表明流体可能含有较高的SiO2、Al2O3和Na2O。全岩的主量元素中, CaO和Al2O3的质量百分比含量很低, 而MgO的含量较高(干体系下多在43%左右), 显示岩石经历了高度熔融。微量元素中, U和Sr的含量较高, 相对富集, 可能是来源较浅的板片流体化学特点的反映。

关键词: 马里亚纳, 橄榄岩, 俯冲带, 交代作用

Abstract: The peridotites beneath arc outcrop at the inner slop of the Mariana Trench because of subduction erosion, which provides us a window to see the geological process in mantle wedge. In this paper, mineral composition, major elements, and trace element data of the peridotites dragged from southern Mariana Trench inner slope are reported to discuss petrogeness and fluid/rock interaction. High Mg of olivine, extremely low Al2O3 of orthopyroxene, and high Cr of spinel indicate the peridotites are refractory. Hydrous minerals in the peridotites such as Talc, amphibole (mainly tremolite with a little magnesiohornblende and edenite) and serpentine indicate fluid that might be rich in SiO2, Na2O and Al2O3 interacting with the refractory peridotites in mantle wedge. Whole rocks contain low concentration of CaO and Al2O3 and high MgO (~43% calculate to anhydrous system) coincidence with refractory nature revealed by mineral composition. The relative enrichment of U and Sr might reflect the chemical characteristics of the fluid released from the subducting slab at shallow depth.

Key words: Mariana, peridotite, subduction zone, forearc mantle metasomatism

中图分类号:

P736.32

董彦辉, 初凤友, 朱继浩, 余星. 马里亚纳南部弧内坡橄榄岩的岩石学及地球化学特征: 对弧前地幔流体交代作用的指示*[J]. 热带海洋学报, 2012, 31(3): 120-127.

DONG Yan-hui, CHU Feng-you, ZHU Ji-hao, YU Xing. Petrology and geochemistry of peridotite dredged from inner slope of Southern Mariana Trench: implication for mantle fluid metasomatism in the forearc setting[J]. Journal of Tropical Oceanography, 2012, 31(3): 120-127.

参考文献

[1] HYNDMAN R D, PEACOCK S M. Serpentinization of the forearc mantle[J]. Earth Planet Sci Lett, 2003, 212(3-4): 417-432.

[2] PEACOCK S A. Fluid Processes in Subduction Zones[J]. Science, 1990, 248(4953): 329-337.

[3] FRYER P, AMBOS E L, HUSSONG D M. Origin and emplacement of Mariana forearc seamounts[J]. Geology, 1985, 13(11): 774-777.

[4] MOTTL M J, WHEAT C G, FRYER P, et al. Chemistry of springs across the Mariana forearc shows progressive devolatilization of the subducting plate[J]. Geochim Cosmochim Acta, 2004, 68(23): 4915-4933.

[5] HULME S M, WHEAT C G, FRYER P, et al. Pore water chemistry of the Mariana serpentinite mud volcanoes: A window to the seismogenic zone[J]. Geochem Geophy Geosy, 2010, 11(1): Q01X09.

[6] BICKFORD M E, SIEGEl D I, MOTTL M J, et al. Strontium isotopic relations among pore fluids, serpentine matrix, and harzburgite clasts, South Chamorro Seamount, Mariana forearc[J]. Chem Geol, 2008, 256(1-2): 24-32.

[7] DESCHAMPS F, GUILLOT S, GODARD M, et al. In situ characterization of serpentinites from forearc mantle wedges: Timing of serpentinization and behavior of fluid-mobile elements in subduction zones[J]. Chem Geol, 2010, 269(3-4): 262-277.

[8] OHARA Y, ISHII T. Peridotites from the southern Mariana forearc: Heterogeneous fluid supply in mantle wedge[J]. Isl Arc, 1998, 7(3): 541-558.

[9] 陈俊兵, 曾志刚. 马里亚纳南部前弧橄榄岩的岩石及矿物学: 对弧下地幔楔交代作用的指示[J]. 海洋地质与第四纪地质, 2007, 27(1): 53-59.

[10] 陈俊兵, 曾志刚. 马里亚纳岛弧南部前弧方辉橄榄岩的交代作用: 单斜辉石和角闪石的微量元素特征[J]. 中国科学: D辑地球科学, 2007, 37(6): 720-727.

[11] STERN R J, BLOOMER S H. Subduction zone infancy: examples from the Eocene Izu-Bonin-Mariana and Jurassic California arcs[J]. Geol Soc Am Bull, 1992, 104(12): 1621-1638.

[12] MURATA K, MAEKAWA H, YOKOSE H, et al. Significance of serpentinization of wedge mantle peridotites beneath Mariana forearc, western Pacific[J]. Geosphere, 2009, 5(2): 90-104.

[13] BLOOMER S H. Distribution and Origin of Igneous Rocks from the landward slopes of the Mariana trench: implicaitons for its structure and evolution[J]. J Geophys Res, 1983, 88(B9): 7411-7428.

[14] NIU YAOLING, Langmuir C H, Kinzler R J. The origin of abyssal peridotites: a new perspective[J]. Earth Planet Sci Lett, 1997, 152(1-4): 251-265.

[15] 刘颖, 刘海臣. 用ICP―MS准确测定岩石样品中的40余种微量元素[J]. 地球化学, 1996, 25(6): 552-558.

[16] SUN SHENSU, MCDONOUGH W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes[J]. Geological Society, London, Special Publications, 1989, 42(1): 313-345.

[17] WORKMAN R K, HART S R. Major and trace element composition of the depleted MORB mantle (DMM)[J]. Earth Planet Sci Lett, 2005. 231(1-2): 53-72.

[18] WANG XIAOMEI, ZENG ZHIGANG, LIU CHANGHUA, et al. Trace element composition of peridotites from the southern Mariana forearc:Insights into the geochemical effects of serpentinization and/or seafloor weathering[J]. Chin J Oceanol Limnol, 2009, 27(4): 985-992.

[19] HORNE R A. Marine chemistry: the structure of water and the chemistry of the hydrosphere[M]. New York: Wiley-Interscience, 1969: 151-155.

[20] PAULICK H, BACH W, GODARD M, et al. Geochemistry of abyssal peridotites (Mid-Atlantic Ridge, 15°20'N, ODP Leg 209): Implications for fluid/rock interaction in slow spreading environments[J]. Chem Geol, 2006, 234(3-4): 179-210.

[21] PARKINSON I J, PEARCE J A. Peridotites from the Izu-Bonin-Mariana forearc (ODP Leg 125): Evidence for mantle malting and melt-mantle interaction in a supra-subduction zone setting[J]. J Petrol, 1998, 39(9): 1577-1618.

马里亚纳南部弧内坡橄榄岩的岩石学及地球化学特征: 对弧前地幔流体交代作用的指示*

Petrology and geochemistry of peridotite dredged from inner slope of Southern Mariana Trench: implication for mantle fluid metasomatism in the forearc setting

PDF (PC)

赞

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 9

Metrics

本文评价

推荐阅读 0

[1]	曹令敏, 赵亮, 赵明辉, 丘学林, 袁怀玉. 新西兰弧后塔拉纳基地区地幔楔各向异性^*[J]. 热带海洋学报, 2023, 42(1): 124-134.
[2]	赵明辉, 程锦辉, 高金尉, 孙龙涛, 徐亚, 张佳政, 杜峰. 南海东部马尼拉俯冲带深部结构新认识^*[J]. 热带海洋学报, 2021, 40(3): 25-33.
[3]	李云杰, 周鹏翔, 夏少红, 万奎元, 孙金龙. 日本九州俯冲带b值成像及其构造意义 ^*[J]. 热带海洋学报, 2021, 40(1): 122-132.
[4]	赵旭, 徐敏, 曾信, 林间. 北印度洋苏门答腊和莫克兰俯冲带地震海啸综述[J]. 热带海洋学报, 2017, 36(6): 62-70.
[5]	于俊辉, 阎贫, 林间. 南海西南次海盆与超慢速扩张西南印度洋中脊地壳结构对比^#cod#x0002A;[J]. 热带海洋学报, 2017, 36(6): 51-61.
[6]	刘思青, 赵明辉, 张佳政, 孙龙涛, 徐亚, 詹文欢, 丘学林. 马尼拉海沟俯冲带前缘(21°N)海底地震仪数据处理初步成果^*[J]. 热带海洋学报, 2017, 36(2): 60-69.
[7]	赵明辉, 贺恩远, 孙龙涛, 徐亚, 游庆瑜, 郝天珧, 杜峰, 丘学林. 马里亚纳海沟俯冲带深地震现状对马尼拉海沟俯冲带的研究启示*[J]. 热带海洋学报, 2016, 35(1): 48-60.
[8]	宋晓晓, 李春峰. 西太平洋科学大洋钻探的地球动力学成果^*[J]. 热带海洋学报, 2016, 35(1): 17-30.
[9]	鲁宝亮, 王万银, 张功成, 王璞珺. 红河断裂带海域延伸位置的地球物理证据及其与南海扩张的关系^*[J]. 热带海洋学报, 2015, 34(5): 64-74.