大别—苏鲁超高压榴辉岩中高钛石榴子石的成分特征及其与金红石包裹体的成因联系
Characterization of high-Ti eclogitic garnets in the Dabie-Sulu ultrahigh-pressure metamorphic belt (China): Compositional heterogeneity and possible relations to rutile needles in garnet
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摘要: 石榴子石是榴辉岩中的基本造岩矿物。本文对苏鲁地体中的毛北榴辉岩和大别地体中的双河榴辉岩中的石榴子石进行了研究。结果显示，石榴子石都表现出中心“富”钛特征，即石榴子石颗粒的中心部位的TiO2含量（0.10%~0.50%）明显高于正常榴辉岩中石榴子石的钛含量(TiO2 一般2，揭示其超深源特征。此外，在石榴子石中发现了一颗TiO2含量达8%~9%的钙铝榴石，具超深源成因特征。因此，本文认为超钛钙铝榴石也是超高压变质作用的标志矿物。Abstract: Garnet is one of the principle rock-forming minerals in eclogites. This mineral, in this paper, was studied to characterize distribution features of titanium in garnet from the Maobei eclogite in the Sulu terrane and the Shuanghe eclogite in the Dabie terrane. Results demonstrated that garnet grains display generally high-Ti cores which are characetrized by the high TiO2(0.10%~0.50%). This value is higher than that in classic garnets from eclogitic rocks (generally TiO2ca.1.70%, which was converted to a depth of formation more than 200km according to published experimental data. Moreover, Ti-rich grossular (ca.8%~9% TiO2), rarely reported in literature, was also identified as inclusion in garnet from the Maobei eclogite. Such a type of garnet reveals a deep subduction process. Therefore, supertitanic grossular maybe also a potential indicator of ultrahigh-pressure metamorphism.
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Key words:
- High-Ti garnet /
- Rutile inclusions /
- Exsolution /
- Maobei /
- Shuanghe /
- Eclogites
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[1] Carswell DA,Wilson RN,Zhai M,Ultra-high pressure aluminous titanites in carbonate-bearing eclogites at Shuanghe in Dabieshan,central China,Mineralogical Magazine,1996.
[2] Cong B,Zhai MG,Carswell DA,Wilson RN Wang QC Zhao ZY and Windley BF,Petrogenesis of ultrahigh-pressure rocks and their country rocks at Shuanghe in Dabieshan,Central China,European Journal of Mineralogy,1995.
[3] Ellis DJ,Green DH,An experimental study of the effect of Ca upon garnet-clinopyroxene Fe-Mg exchange equilibria,Contributions to Mineralogy & Petrology,1979.
[4] Enami M,Suzuki K,Liou JG,Bird K,Al-Fe3+ and F-OH substitutions in titanite and constraints on their P-T dependence,European Journal of Mineralogy,1993.
[5] Force ER,Geology of titanium-mineral deposits,Geological Society of America Special Paper,1991(259).
[6] Goldsmith R,Force ER,Distribution of rutile in metamorphic rocks and implications for placer deposits,Mineralium Deposita,1978.
[7] Griffin WL,Major transformations reveal Earth\'s deepsecrct,Geology,2008.
[8] Huang JP,Ma DS,Liu C,{?}and Wang H,Rutile deposit in eclogite of ultra-high pressure metamorphic belt in the Northeast of Jiangsu Province and ore genesis,Journal of Nanjing University(Natural Science),2002.
[9] Hwang SL,Shen P,Yui TF,{?}and Chu HT,TiO2 nanoparticle trails in garnet:Implications of inclusion pressure-induced microcracks and spontaneous metamorphic-reaction healing during exhumation,Journal of Metamorphic Geology,2007(04).
[10] Hwang SL,Yui TF,Chu HT,Shen P Schertl HP Zhang RY and Liou JG,On the origin of oriented rutile needles in garnet from UHP eclogites,Journal of Metamorphic Geology,2007(03).
[11] Liou JG,Zhang RY,Jahn B,Petrology,geochemistry and isotope data on a ultrahigh-pressure jadeite quartzite from Shuanghe,Dabie mountains,east-central China,Lithos,1997(1-3).
[12] Liu FL,Special mineral inclusions preserved in zircons from gneisses in Maobei area,southwestern Sulu terrane:Indicating the possible deep-subduction of gneisses to depths greater than 120km,Acta Petrologica Sinica,2003(03).
[13] Niu HC,Zhang JX,Shan Q,Yu XY,Discovery of super-silicic and super-titanic garnets in garnet-pyroxenite in Zhabeba and its geological significance,Chinese Science Bulletin,2007(14).
[14] Oberti R,Smith DC,Rossi G,Caucia F,The crystal-chemistry of high-aluminum titanites,European Journal of Mineralogy,1991.
[15] Okay AI,Xu ST,Sengor AMC,Coesite from the Dabie Shan eclogites,eastern China,European Journal of Mineralogy,1989.
[16] Putnis CV,Geisler T,A mechanism of ion exhange in fluidmineral interaction,2007.
[17] Rudnick RL,Barth M,Hom I,McDonough WF,Rutilebearing refractory eclogites:Missing link between continents and depleted mantle,Science,2000.
[18] Stachel T,Diamonds from the asthenosphere and the transition zone,European Journal of Moneralogy,2001.
[19] Stanaway KJ,The eastern North America titanium province:A review,LITHOLOGY AND MINERAL RESOURCES,1996.
[20] Tappert R,Stachel T,Harris JW,Muehlenbachs K Ludwig T and Brey GP,Subducting oceanic crust:The source of deep diamonds,Geology,2005.
[21] Wang RC,Wang S,Qiu JS,Ni P,Rutile in the UHP eclogites from the CCSD main drill hole (Donghai,eastern China):Traceelement geochemistry and metallogenetic implications,Acta Petrologica Sinica,2005(02).
[22] Wang RC,Qiu JS,Ni P,Wang S Hu J and Zhu X,Titanium mineralization in Sulu Ultrahigh-Pressurc eclogites:Mineralization at the convergent boundary between North China Plate and Yangtze Plate,Acta Geologica Sinica,2006(12).
[23] Wang S,Wang RC,Qiu JS,Ni P and Yu JJ,Mineral inclusions in rutile of Sulu UHP eclogites from the main drill hole CCSD,Donghai,Acta Petrologica et Mineralogica,2006.
[24] Wang XM,Liou JG,Man HK,Coesite-bearing eclogite from the Dabie Mountains in central China,Geology,1989.
[25] Xu ZQ,Etude tectonique et microtectonique de la cha ne pal ozoique et triasique des Quilings (Chine),Th se de doctorat,Univ.Sci.Tech.Languedoc,Montpellier,1987.
[26] Xu ZQ,Continental deep subduetion dynamics:Evidence from the main hole of the Chinese Continental Scientific Drilling and the Sulu HP-UHP metamorphic terrane,Acta Petrologica Sinica,2007(12).
[27] Xu ZQ,Yang JS,Deep drilling in the Dabie-Sulu ultrahigh pressure metamorphic belt,China,EOS,2005(08).
[28] Ye K,Cong B,Ye D,The possible subduction of continental material to depths greater than 200km,Nature,2000.
[29] Ye K,Liu JB,Cong BL,Ye DL Xu P Omori S and Maruyama S,Ultrahigh-pressure (UHP) low-Al titanites from carbonatebeating rocks in Dabieshan-Sulu UHP terrane,eastern China,American Mineralogist,2002.
[30] Zack T,Kronz A,Foley SF,Rivers T,Trace element abundances in rutiles from eclogites and associated garnet mica schists,Chemical Geology,2002.
[31] Zack T,Moraes R,Kronz A,Temperature dependence of Zr in rutile:Empirical calibration of a rutile thermometer,Contributions to Mineralogy & Petrology,2004(04).
[32] Zhang RY,Liou JG,Exsolution lamellae in minerals from ultrahigh-pressure rocks,International Geology Review,1999.
[33] Zhang RY,Zhai SM,Fei YW,Liou JG,Titanium solubility in coexisting garnet and clinopyroxene at very high pressure:The significance of exsolved rutile in garnet,Earth and Planetary Science Letters,2003.
[34] Zhang RY,Liou JG,Zheng JP,Griffin WL Yui TF and O\'Reilly SY,Petrogenesis of the Yangkou layered garnet-peridotite complex,Sulu UHP terrone,China,American Mineralogist,2005.
[35] 黄建平,马东升,刘聪,王辉,苏北超高压变质带榴辉岩型金红石矿床及其成因,南京大学学报(自然科学版),2002.
[36] 刘福来,南苏鲁毛北地区片麻岩锆石中的特殊矿物包体:指示120km深俯冲的证据,岩石学报,2003(03).
[37] 牛贺才,张海祥,单强,于学元,扎河坝石榴辉石岩中超硅-超钛石榴子石的发现及其地质意义,科学通报,2007(18).
[38] 王汝成,王硕,邱检生,倪培,CCSD主孔揭示的东海超高压榴辉岩中的金红石:微量元素地球化学及其成矿意义,岩石学报,2005(02).
[39] 王汝成,邱检生,倪培,王硕,胡建,朱霞,苏鲁超高压榴辉岩中的钛成矿作用:大陆板块汇聚边界的成矿作用,地质学报,2006(12).
[40] 王硕,王汝成,邱检生,倪培,余金杰,CCSD主孔超高压榴辉岩金红石中的矿物包裹体研究,岩石矿物学杂志,2006(01).
[41] 许志琴,深俯冲和折返动力学:来自中国大陆科学钻探主孔及苏鲁超高压变质带的制约,岩石学报,2007(12).
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