中国大陆科学钻探主孔高钛与低钛榴辉岩地球化学特征对比及其对金红石成矿的指示意义
Geochemical comparison between high-Ti and Iow-Ti edogites from the main hole of the Chinese Continental Scientific Drill Project and its implications for rutile mineralization
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摘要: 榴辉岩型金红石矿床是我国原生金红石矿床的最重要类型。本文以中国大陆科学钻探主孔0~2000m范围内揭露的榴辉岩为对象,通过对榴辉岩中TiO2与其它元素协变关系的全面分析,同时结合我国原生榴辉岩型金红石矿床TiO2的平均品位,将榴辉岩区分为高钛榴辉岩(TiO2〉2%)和低钛榴辉岩(TiO2〈2%),并据此系统对比了二类榴辉岩地球化学组成的差异。研究结果表明,高钛榴辉岩相对贫硅、贫钾、富铁,Al2O3/TiO2比值和全碱(K2O+Na2O)含量总体偏低,Cs、Rb、Ba等大离子亲石元素和Zr、Hf等高场强元素不同程度亏损,而放射性元素Th、U则相对富集,并总体具有较低的轻重稀土比值。榴辉岩型金红石矿床的形成主要受原岩因素制约,原岩的源区组成、产出环境、起源深度、部分熔融程度和随后的结晶分异过程对Ti的初始富集均具重要影响,富钛基性原岩是榴辉岩型金红石矿床形成的物质基础,高压区域变质作用是这类矿床形成的必要条件。Abstract: The eclogite-type rutile deposit is the most important primary rutile deposit in China. Based on a comprehensive analysis of the correlations between the contents of TiO2 and other elements in eclogites from 0 - 2000m of the main hole of the Chinese Continental Scientific Drilling ( CCSD), and by taking the mean TiO2 grade of the primary rutile deposit in China into account, this paper grouped the eclogites into a high-Ti (TiO2 > 2% ) and a low-Ti (TiO2 < 2% ) subgroup, and systematically compared the geochemical differences between the two subgroups of eclogites. The investigation results have shown that the high-Ti eclogites are relatively depleted in SiO2, K2O, enriched in TFeO, and have lower Al2O3/TiO2 ratios and K2O + Na2O values. They also display vary degree depletions of Cs, Rb, Ba, Zr, Hf and enrichments of Th, U, and generally show lower LREE/HREE ratios. Integrated geochemical data indicate that the protolith of ecologite is the main constraint for the formation of the eclogite-type rutile deposit. The initial Ti enrichment in the protolith rocks is constrained by many factors, such as the source compositions, source depth, tectonic setting, partial melting degree and the crystallization differentiation process, etc. The Ti-rich basic protolith is the material base and the high-pressure regional metamorphism is the essential condition for the generation of the eclogite-type rutile deposit.
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Key words:
- Eclogite /
- Rutile /
- Geochemistry /
- Chinese Continental Scientific Drilling
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[1] 程振香.1990.江苏东海榴辉岩型金红石矿床基本特征.矿床地质,9(1):86-90
[2] Baker M B,Stolper E M.1994. Determining the compositions of highpressure mantle melts using diamond aggregates.Geochimica et Cosmochimica Acta,58:2811-2827
[3] Beattie P.1994. Systematics and energetics of trace-element partitioning between olivine and silicate melts--implications for the nature of mineral/melt partitioning.Chem Geol,117:57-71
[4] 高剑峰,陆建军,赖鸣远,林雨萍,濮巍.2003.岩石样品中微量元素的高分辨率等离子质谱分析.南京大学学报(自然科学),39(6):844-850
[5] 黄建平,马东升,刘聪,王辉.2002.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),38(4):514-524
[6] Bindeman I N,Davis A M,Drake M J.1998. Ion microprobe study of plagioclase-basalt partition experiments at natural concentration level of trace elements.Geochimica et Cosmochimica Acta,62:1175 -1193
[7] Boynton W V.1984. Geochemistry of the rare earth elements:meteorite studies.In:Henderson P (ed).Rare Earth Elements Geochemistry.Amsterdam:Elservier,63-144
[8] 黄建平,马东升,刘聪,王传礼.2003.江苏省新沂市小焦榴辉岩型金红石矿床的特征及成因初探.现代地质,17(4):435-443
[9] 刘勇胜,胡圣虹,柳小明,高山.2003.高级变质岩中Zr、Hf、Nb、Ta的ICP-MS准确分析.地球科学,28(2):151-156
[10] Cheng Z X.1990. Basic characteristics of the Donghai eclogite type rutile deposit in Jiangsu province.Mineral Deposits,9 (1):86-90 (in Chinese with English abstract)
[11] Foley S F,Barth M G,Jenner G A.2000. Rutile/melt partition coefficients for trace element and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas.Geochimca et Cosmochimca Acta,64:933 -938
[12] 刘勇胜,张泽明,Lee Cin-ty,高山,宗克清.2005. CCSD主孔高Ti榴辉岩非耦合的高Ti、低Nb(Zr)特征:对玄武质岩浆房中磁铁矿分离结晶作用的指示.岩石学报,21(2):339-346
[13] Gao J F,Lu J J,Lai M Y,Lin Y P,Pu W.2003. Analysis of trace elements in rock samples using HR-ICPMS.J Nanjing Uni (Natural Sciences),39 (6):844-850 (in Chinese with English abstract)
[14] 牟保磊.1999.元素地球化学.北京:北京大学出版社,27-30
[15] Hirose K,Kushiro I.1993. Partial melting of dry peridotites at high pressure:determination of compositions of melts segregated from peridotite using aggregates of diamond.Earth Planet Sci Lett,114:477-489
[16] 唐红峰,周新民.1997.江南古陆东段两类玄武岩成因的地球化学制约.中国科学,27(4):306-311
[17] Huang J P,Ma D S,Liu C,Wang H.2002. Rutile deposit in eclogite of ultra-high pressure metamorphic belt in the northeast of Jiangsu province and ore genesis.J Nanjing Uni (Natural Sciences),38(4):514-524 (in Chinese with English abstract)
[18] 王立平,王镐,高颀,李献军,陈战乾,窦永庆.2004.我国钛资源分布和生产现状.稀有金属,28(1):265-267
[19] 王汝成,王硕,邱检生,倪培.2005. CCSD揭示的苏鲁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,21(2):465-474
[20] Huang J P,Ma D S,Liu C,Wang C L.2003. Character and origin of rutile deposit in eclogite in Xiaojiao,Xinyi,Jiangsu Province.Geoscience,17 (4):514-524 (in Chinese with English abstract)
[21] 吴维平,江来利,张勇,刘贻灿,张青.2003.安徽大别山金红石矿资源勘查、开发及利用现状.安徽地质,13(11):66-69
[22] Jahn B M.1998. Geochemical and isotopic characteristics of UHP eclogites and ultramafic rocks of the Dabie orogen.In:Hacker B R,Liou J G (eds.),When Continents Collide:Geochemistry of Ultrahigh-Pressure Rocks.Dordrecht:Kluwer Academic Publishing,203-239
[23] Lassiter J C,Depaolo D J.2000. Plume/lithosphere interaction in the generation of continental and oceanic flood basalts:Chemical and isotopic constraints.In:Mahoney J,Coffin M F (eds.).Large Igneous Provinces:Continental,Oceanic,and Planetary Flood Volcanism.Washington:American Geophysical Union Monograph 100,335-355
[24] 徐珏,陈毓川,王登红,余金杰,李纯杰,傅旭杰,陈振宇.2004.中国大陆科学钻探主孔100~2000米超高压变质岩中的钛矿化.岩石学报,20(1):119-126
[25] 徐少康.1999.建国50年来我国金红石矿产地质勘查及研究历史的回顾.化工矿产地质,2l(3):188-192
[26] Liu Y S,Hu S H,Liu X M,Gao S.2003. Accurate analysis of Zr,Hf,Nb and Ta in high-grade metamorphic rocks with ICP-MS.Earth Sciences--J China Uni Geosci,28(2):151-156 (in Chinese with English abstract)
[27] 徐义刚,钟孙霖.2001.峨眉山大火成岩省:地幔柱活动的证据及其熔融条件.地球化学,30(1):1-9
[28] Liu Y S,Zhang Z M,Lee C T,Gao S,Zong K Q.2005. Decoupled high-Ti from low-Nb(Zr) of eclogites from the CCSD:implications for magnetite fractional crystallization in basalt chamber.Acta Petrologica Sinica,21 (2):339-346 (in Chinese with English abstract)
[29] McDonough W F,Sun S S.1995. The composition of the Earth.Chem Geol,120:223-253
[30] 杨经绥,陈世忠,张仲明,许志琴,吴才来,刘福来,李天福,陈松永,陆永增.2005.苏鲁超高压变质带岗上石榴石橄榄岩体:中国大陆科学钻探卫星孔(CCSD-PP3钻孔)初步研究.岩石学报,21(2):293-304
[31] 尹玉军.1991.苏北、胶南地区榴辉岩的特征及成因探讨.岩石矿物学杂志,10(1):11-20
[32] Mu B L.1999. Elemental Geochemistry.Beijing:Beijing University Press,27 -30 (in Chinese)
[33] Pearce J A,Gale G H.1977. Identification of ore-deposition environment from trace element geochemistry of associated igneous host rocks.Geol Soc Spec Publ,7:14 -24
[34] 张泽明,许志琴,刘福来,游振东,沈昆,杨经绥,李天福,陈世忠.2004.中国大陆科学钻探工程主孔100~2050m榴辉岩岩石化学研究.岩石学报,20(1):27-42
[35] 张泽明,张金凤,许志琴,刘福来,杨经绥,肖益林,沈昆.2005.中国大陆科学钻探工程主孔榴辉岩的岩石学研究.中国地质,32(2):205-217
[36] Prouteau G,Scaillet B,Pichavant M,Maury R C.1999. Fluid-present melting of ocean crust in subduction zones.Geology,27:1111 -1114
[37] 赵子福,郑永飞,陈斌,吴元保.2005.中国大陆科学钻探主孔(734~933m)榴辉岩和片麻岩元素及Sr-Nd同位素地球化学研究.岩石学报,21(2):325-338
[38] Rapp R P,Watson E B.1995. Dehydration melting of metabasalt at 8 -32 kbar:Implications for continental growth and crust-mantle recycling.J Petrol,36:891 -931
[39] Schmickler B,Jacob D E,Foley S F.2004. Eclogite xenoliths from the Kuruman kimberlites,South Africa:geochemical fingerprinting of deep subduction and cumulate processes.Lithos,75:173 -207
[40] Sun S S,Nesbitt R W.1978. Geochemical regularities and genetic significance of ophiolitic basalts.Geology,6:689-693
[41] Tang H F,Zhou X M.1997. Geochemical constraints on the petrogenesis of basalts from eastern Jiangnan orogen,south China.Science in China,27(4):306 -311 (in Chinese)
[42] Wang L P,Wang G,Gao Q,Li X J,Chen Z Q,Dou Y Q.2004. Distribution and production status of titanium resources in China.Chinese J of Rare Metals,28 (1):265-267 (in Chinese with English abstract)
[43] Wang R C,Wang S,Qiu J S,Ni P.2005. Rutile in the UHP eclogites from the CCSD main drill-hole (Donghai,eastern China):Traceelement geochemistry and metallogenetic implications.Acta Petrologica Sinica,21 (2):465-474 (in Chinese with English abstract)
[44] Winchester J A,Floyd P A.1977. Geochemical discrimination of different magma series and their differentiation products using immobile elements.Chem Geol,20:325-343
[45] Wu W P,Jiang L L,Zhang Y,Liu Y C,Zhang Q.2003. Exploration and exploitation of rutile resources in the Dabieshan orogen,Anhui province.Geology of Anhui,13 (11):66-69 (in Chinese with English anstract)
[46] Xu J,Chen Y C,Wang D H,Yu J J,Li C J,Fu X J,Chen Z Y.2004. Titanium mineralization in ultrahigh-pressure metamorphic rocks from Chinese Continental Scientific Drilling Project.Acta Petrologica Sinica,20(1):119-126 (in Chinese with English abstract)
[47] Xu S K.1999. Review the 50 years of Chinese rutile minerals exploration and research.Geology of Chemical Minerals,21 (3):188-192 (in Chinese with English abstract)
[48] Xu Y G,Zhong S L.2001. The E\' meishan large igneous province:Evidence for mantle plume activity and melting conditions.Geochimica,30(1):1 -9 (in Chinese with English abstract)
[49] Yang J S,Chen S Z,Zhang Z M,Xu Z Q,Wu C L,Liu F L,Li T F,Chen S Y,Lu Y Z.2005. A preliminary study of the Chinese Continental Scientific Drilling (CCSD) PP3 hole on the Gangshang garnet peridotite body in the Sulu UHPM belt.Acta Petrologica Sinica,21 (2):293-304 (in Chinese with English abstract)
[50] Yin Y J.1991. Characteristics and petrogenesis of the eclogites in Shandong and Jiangsu.Acta Petrologica et Mineralogica,10(1):11-20 (in Chinese with English abstract)
[51] Zhang Z M,Xu Z Q,Liu F L,You Z D,Shen K,Yang J S,Li T F,Chen S Z.2004. Geochemistry of eclogites from the main hole (100~2050m) of the Chinese Continental Scientific Drilling Project.Acta Petrologica Sinica,20 (1):27-42 (in Chinese with English abstract)
[52] Zhang Z M,Zhang J F,Xu Z Q,Liu F L,Yang J S,Xiao Y L,Shen K.2005. Petrology of eclogites from the main hole of the Chinese Continental Scientific Drill Project.Geology in China,32(2):205-217 (in Chinese with English abstract)
[53] Zhao Z F,Zheng Y F,Chen B,Wu Y B.2005. A geochemical study of element and Sr-Nd isotopes for eclogites and gneiss from CCSD core 734 to 933m.Acta Petrologica Sinica,21 (2):325-338 (in Chinese with English abstract)
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