苏北榴辉岩中金红石的微量元素地球化学特征
Trace elements geochemistry of eclogites in the northern Jiangsu province, eastern China
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摘要: 本文利用电子探针分析了苏北地区三类榴辉岩中金红石的Nb、Cr和Zr含量，在Zaek et al．（2002）的金红石Nb-Cr图解中，三类榴辉岩的原岩均为镁铁质岩，但它们具有不同的地球化学特征，即（1）小焦G类金红石榴辉岩中金红石的Nb含量最低，平均值为68ppm，而其它两类榴辉岩中金红石的Nb含量较高，平均值介于192～255ppm；（2）蓝晶石榴辉岩具有极高Cr含量，均值6106ppm，而许沟P类榴辉岩中金红石的Cr含量也较高，均值1233ppm，金红石榴辉岩中金红石Cr含量最低，均值为183ppm。利用Zaek et al．（2004）提出的金红石地质温度计，计算得出许沟P类榴辉岩的金红石形成温度介于600～751℃，平均温度689℃；演马厂M类榴辉岩的金红石温度介于507～641℃，平均温度557℃；小焦G类金红石榴辉岩金红石的形成温度介于541～673℃，平均温度613℃；新扬昌G类蓝晶石榴辉岩的金红石形成温度介于541～655℃，平均温度603℃。一种可能的解释是，榴辉岩在拆返过程中退变质作用明显，流体活动强烈，导致金红石中Zr扩散丢失，金红石中Zr含量不同程度地受到角闪岩相退变质过程中再平衡作用的影响，致使计算的温度偏低。
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Key words:
- Rutile /
- Trace elements /
- Eclogite /
- Provenance /
- Reequilibrium /
- Northern Jiangsu province
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[1] 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.Journal of Nangjing university (Natural Series),38:512-524
[2] 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),38:512-524
[3] 李晓峰,陈振宇,王汝成,徐珏,王平安,佘金杰.2005.江苏东海毛发状水晶中金红石矿物学、地球化学特征.岩石学报,21(2):475-481
[4] Li,XF,Chen Z Y,Wang R C,Xu J,Wang P A,Yu J J.2005. Mineralogical and geochemical features of hail-like rutile in quartz crystal in Donghai,Jiangsu province,China.Acta Petrologica Sinica,21 (2):475-481
[5] 潘明宝,张庆龙,陈火根,王浩,郭令智.2002.苏鲁造山带南缘岩石-地层格架.地质通报,21(12):848-854
[6] Liu F L,Xu Z Q,Katayama I,Yang J S,Maruyama S,Liu J G.2001. Mineral inclusions in zircon of para-and orthogneiss from pre-pilot drillhole CCSD-PP1,Chinese continental scientific drilling project.Lithos,59:199 -215
[7] Liu F L,Xu Z Q,Liou J G,Katayama I,Masago H,Maruyama S,Yang J S.2002. Ultrahigh-pressure mineral inclusions in zircons from gneiss core samples of the Chinese Continental Scientific Site in eastern China.Eur.J.Mineral.,14:499-512
[8] 王汝成,王硕,邱检生,倪培.2005. CCSD主孔揭示的东海榴辉岩中的金红石:微量元素地球化学及其成矿意义.岩石学报,21(2):465-474
[9] 许志琴,张泽明,刘福来,杨经绥,李海兵,杨天南,邱海峻,李天福,孟繁聪,陈世忠,唐哲民,陈方远.2003.苏鲁高压-超高压变质带的折返构造及折返机制.地质学报,77(4):433-450
[10] Liu F L,Xu Z Q,Liou J G,Song B.2004. SHRIMP U-Pb ages of ultrahigh-pressure and retrograde metamorphism of gneisses,southwestern Sulu terrane,eastern China.J.Metamorphic Geol.,22:315 -326
[11] Pan M B,Zhang Q L,Chen H G,Wang H,Guo L Z.2002. Lithostratigraphic framework on the southern margin of the Su-Lu orogen.Geological Bulletin of China,21 (12):848-854 (in Chinese with English abstract)
[12] 于津海,王赐银,林黎明.2001.苏北高压变质带及与北侧超高压变质带的关系.地质学报,75(1):82-90
[13] Wang R C,Wang S,Qiu J S,Ni P.2005. Rutile in the UHP eclogites from the CCSD main drillhole (Donghai,eastern China):traceelement geochemistry and metallogenetic implications.Acta Petrologica Sinica,21 (2):465-474 (in Chinese with English abstract)
[14] 叶凯,徐平.1992.山东荣成大疃榴辉岩成因岩石学研究.岩石学报,8(1):27-39
[15] Xu Z Q,Zhang Z M,Liu F L,Yang J S,Li H B,Yang T N,Qiu H J.LiT F,Meng F C,Chen S Z,Tang Z M,Chen F Y.2003. Exhumation structure and mechanism of the Sulu ultrahigh-pressure metamorphic belt,central China.Acta Geologica Sinica,77 (4):433 -450 (in Chinese with English abstract)
[16] 张泽明,许志琴,刘福来,孟繁聪,杨天南,李天福,殷秀兰.2002.苏鲁造山带根部的物质组成及变质作用.地质通报,21:609-616
[17] 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(100～2050米)主孔榴辉岩岩石化学研究.岩石学报,20(1):27-42
[18] Yao Y P,Ye K,Liu J B,et al.2000. A trainsitional eclogite-to high pressure granulite-facies overprint on coesite eclogite at Taohang in the Sulu ultrahigh-pressure terrane,Eastern China.Lithos,52:109-120
[19] 张泽明,张金风,游振东,沈昆.2005.苏鲁造山带超高压变质作用及其P-T-t轨迹.岩石学报,21(2):257-270
[20] Ye K,Xu P.1992. Petrology and its origin of the Datuan eclogite,Rongcheng county,Shandong province.Acta Petrologica Sinica,8(1):27-39 (in Chinese with English abstract)
[21] Yu J H,Wang C Y,and Lin L M.2001. Nature of the high pressure metamorphic zone and its relationship with the ultra-high pressure metamorphic zone in northern Jiangsu province,China.Acta Geologica Sinica,75 (1):82-90 (in Chinese with English abstract)
[22] 张儒媛,从柏林,刘忠光.1993.苏鲁超高压变质地体及其成因解释.岩石学报,9(3):211-226
[23] Zhang R Y,Cong B L,Liu Z G.1993. The Sulu ultrahigh pressure metamorphic massif and its origin.Acta Petrologica Sinica,9 (3):211 -226(in Chinese with English abstract)
[24] 朱永峰.2005.超高压变质大理岩中的白云石分解结构:大陆地壳物质深循环的新证据.岩石学报,21(2):347-354
[25] Zhang R Y,Hirajima T,Banno S,Cong B L,Liou J G.1995. Petrology of ultrahigh-pressure rocks from the southern Su-Lu region,eastern China.Journal of Metamorphic Geology,13,659-675
[26] Zhang Z M,Xu Z Q,Liou J,et al.2005. Oxygen isotope geochemistry of rocks from the Pre-Pilot Hole of the Chinese Continental Scientific Drilling Project (CCSD-PPH1).American Mineralogist,90:857-863
[27] Zhang Z M,Xu Z Q,Liu F L,Meng F C,Yang T N,Li T F,Yin X L.2002. Composition and metamorphism and the root of the southern Sulu orogen.Geological Bulletin of China,21:609～616 (in Chinese with English abstract)
[28] 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)
[29] Zhang Z M,Xu Z Q,Xu H F.2000. Petrology of ultrahigh-pressure eclogites from the ZK703 drillhole in the Donghai,eastern China.Lithos,52:35-50
[30] Zhang Z M,Zhang J F,You Z D,Shen K.2005. Ultrahigh-pressure metamorphic P-T-t path of the Sulu orogenic belt,eastern central China.Acta Petrologica Sinica,21 (2):257-270 (in Chinese with English abstract)
[31] Zack T,Kronz A,Foley S F,Rivers T.2002. Trace element abundances in rutiles from eclogites and associated garnet mica schists.Chemical Geology,184:97-122
[32] Zack T,Moraes R,Krone A.2004. Temperature dependence of Zr in rutile:empirical calibration of a rntile thermometer.Contributions to Mineralogy and Petrology,148:471-488
[33] Zhu Yongfeng.2005. Dolomite decomposition texture in ultrahigh pressure metamorphic marble:new evidence for the deep recycling of continental materials.Acta Petrologica Sinica,21 (2):347-354(in Chinese with English abstract)
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