大别—苏鲁超高压变质带榴辉岩部分熔融的证据——微量元素和铅同位素

贾望鲁; 高山; 王林森; 胡圣虹

Volume 28 Issue 2

Mar. 2003

Turn off MathJax

Article Contents

Article Navigation > Earth Science > 2003 > 28(2): 121-128

JIA Wang-lu, GAO Shan, WANG Lin-sen, HU Sheng-hong, 2003. Evidence of Partial Melting of Eclogites from Dabie-Sulu Ultrahigh-Pressure Metamorphic Belt: Trace Elements and Pb Isotope. Earth Science, 28(2): 121-128.

Citation:

PDF( 1216 KB)

Evidence of Partial Melting of Eclogites from Dabie-Sulu Ultrahigh-Pressure Metamorphic Belt: Trace Elements and Pb Isotope

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2002-06-08
Publish Date: 2003-03-25

Abstract

Abstract

Partial melting of subducted oceanic crust is one of the most important processes of continental growth. However, we see little direct evidence of partial melting of the continental during subduction. The difference in trace elements and Pb isotope between dehydration and partial melting of island arc basalt (IAB) is discussed based on the distribution coefficients of trace elements published. Although Pb was incompatible in both dehydration and partial melting, the activity of Pb was higher significantly than other incompatible elements (Rb, Ba, Sr, Th and U) in dehydration, and lower in partial melting. As a result, the evolution pathlous of dehydration and partial melting shows a large difference in the w (Rb) /w (Pb) -w (Rb), w (Ba) /w (Pb) - w (Ba), w (Th) /w (Pb) -w (Th), w (U) /w (Pb) -w (U) figure. Furthermore, the difference of incompatibility among Pb, Th and U leads to a significant distinction of single mineral isotope of garnet and omphacite between dehydration and partial melting. Moreover, the composition of trace elements and Pb isotope of actual measurements and that of analog calculation was compared. Most eclogites from Dabie-Sulu ultrahigh pressure belt might be residual after partial melting of IAB, however, the others were products of dehydration of IAB. Therefore, continental basaltic rocks could also be partially melted during subduction like the oceanic crust.
- dehydration,
- partial melting,
- trace element,
- Pb isotope,
- eclogite

FullText(HTML)

References(20)

References

[1]	Ayers J C. Trace element modeling of aqueous fluid-peridotite interaction in the mantle wedge of subduction zone [J]. Contribution to Mineralogy and Petrology, 1998, 132: 390-404. doi: 10.1007/s004100050431
[2]	Rapp R P, Waston E B. Dehydration melting of metabasalt at 8-32 kbar: implications for continental growth and crust-mantle recycling[J]. Journal of Petrology, 1995, 36: 891-931. doi: 10.1093/petrology/36.4.891
[3]	Drummond M J, Defant M J. A model for trondhjemite-tonalite-dacite genesis and crustal growth via slab melting: Archean to modern comparisons[J]. Journal of Geophysical Research, 1990, 95(B13): 21503-21521. doi: 10.1029/JB095iB13p21503
[4]	从柏林, 王清晨. 大别山—苏鲁超高压变质带研究的最新进展[J]. 科学通报, 1999, 44: 1127-1137. doi: 10.3321/j.issn:0023-074X.1999.11.002 CONG B L, WANG Q C. The Dabie-Sulu UHP rocks belt: review and prospect[J]. Chinese Science Bulletin, 1999, 44: 1127-1137. doi: 10.3321/j.issn:0023-074X.1999.11.002
[5]	索书田, 钟增球, 张宏飞, 等. 桐柏高压变质带及其区域构造型式[J]. 地球科学—中国地质大学学报, 2001, 26(6): 551-558. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200106000.htm SUO S T, ZHONG Z Q, ZHANG HF, et al. High-pressure metamorphic belt and tectonic pattern in Tongbai mountins, central China[J]. Earth Science— Journal of China University of Geosciences, 2001, 26(6): 551-558. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200106000.htm
[6]	钟增球, 索书田, 张宏飞, 等. 桐柏—大别碰撞造山带的基本组成与结构[J]. 地球科学—中国地质大学学报, 2001, 26(6): 560-567. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200106001.htm ZHONG Z Q, SUO S T, ZHNAG HF, et al. Major constituents and texture of the Tongbai-Dabie collisional orogenic belt[J]. Earth Science— Journal of China University of Geosciences, 2001, 26(6): 560-567. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200106001.htm
[7]	金振民, 章军锋, Green H W, 等. 大别山超高压榴辉岩流变强度—来自高温高压实验的证据[J]. 地球科学—中国地质大学学报, 2001, 26(6): 574-580. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200106003.htm JIN Z M, ZHANG J F, Green H W, et al. Rheological strength of UHP eclogite from Dabie Shan: evidences from high p-T experiments[J]. Earth Science — Journal of China University of Geosciences, 2001, 26(6): 574-580. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200106003.htm
[8]	Jahn B M. Geochemical and isotopic characteristics of UHP eclogites and ultramafic rocks of Dabie orogen: implications for continental subductions and collisional tectonics[A]. In: Hacker B R, Liou J Q, eds. When continents collide: geodynamics and geochemistry of ultrahigh-pressure rocks [C]. Netherlands: Kluwer Academic Publishers, 1998. 203-239.
[9]	Patino Douce A E, McCarthy T C. Melting of crustal rocks during continental collision and subduction[A]. In: Hacker B R, Liou J Q, eds. When continents collide: geodynamics and geochemistry of ultrahigh-pressure rocks [C]. Netherlands: Kluwer Academic Publishers, 1998. 27-55.
[10]	Brenan J M, Shaw H F, Ryerson F J, et al. Mineralaqueous fluid partitioning of trace element chemistry of mantle and deep crustal fluids[J]. Geochimica et Cosmochimica Acta, 1995, 59: 3331-3350. doi: 10.1016/0016-7037(95)00215-L
[11]	Kogiso T, Tatsumi Y, Nakano S. Trace element transport during dehydration processes in the subducted oceanic crust: 1. experiments and implications for the origin of ocean island basalts[J]. Earth and Planetary Science Letters, 1997, 148: 193-205. doi: 10.1016/S0012-821X(97)00018-6
[12]	Thoni M, Jagoutz E. Some new aspects of dating eclogites in orogenic belts: Sm-Nd, Rb-Sr and Pb-Pb isotopic results from the Austroalpine Saualpe and Koralpe typelocality[J]. Geochimica et Cosmochimica Acta, 1992, 56: 347-368. doi: 10.1016/0016-7037(92)90138-9
[13]	李曙光, 陈移之, 葛宁洁, 等. 青岛榴辉岩及胶南群片麻127第2期贾望鲁等: 大别—苏鲁超高压变质带榴辉岩部分熔融的证据—微量元素和铅同位素岩的锆石U-Pb年龄[J]. 科学通报, 1993, 38: 1773-1777. LI S G, CHEN Y Z, GE N J, et al. U-Pb zircon ages of eclogite and gneiss from Jiaoan Group in Qingdao area [J]. Chinese Science Bulletin, 1993, 38: 1773-1777.
[14]	李曙光, Jagoutz E, 肖益林. 大别山-苏鲁地体超高压变质年代学—Ⅰ. Sm-Nd同位素体系[J]. 中国科学(D辑), 1996, 26: 249-257. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199603008.htm LI S G, Jagoutz E, XIAO Y L. Chronology of ultrahighpressure metamorphism in the Dabie mountains and Su-Lu terrane: Ⅰ. Sm-Nd isotope system[J]. Science in China (Series D), 1996, 26: 249-257. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199603008.htm
[15]	高山, Yumin Qiu, 凌文黎, 等. 大别山英山和熊店榴辉岩单颗粒锆石SHRIMP U-Pb年代学研究[J]. 地球科学—中国地质大学学报, 2002, 27(5): 558-564. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200901019.htm GAO S, Qiu Y M, LING W L, et al. SHRIMP single zircon U-Pb geochronology of eclogites from Yingshan and Xiongdian[J]. Earth Science — Journal of China University of Geosciences, 2002, 27(5): 558-564. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200901019.htm
[16]	徐佩芬, 孙若昧, 刘福田, 等. 扬子板块俯冲、断离的地震层析成像证据[J]. 科学通报, 1999, 44: 1658-1661. doi: 10.3321/j.issn:0023-074X.1999.15.019 XU P F, SUN R M, LIU F T, et al. Seismic tomography showing subduction and slab breakoff of the Yangtze block beneath the Dabie-Sulu orogenic belt[J]. Chinese Science Bulletin, 1999, 44: 1658-1661. doi: 10.3321/j.issn:0023-074X.1999.15.019
[17]	游振东, 韩郁箐, 杨巍然, 等. 东秦岭大别高压超高压变质带[M]. 武汉: 中国地质大学出版社, 1998. YOU Z D, HAN Y Q, YANG W R, et al. East QinlingDabie high and ultrahigh-pressure metamorphism belt [M]. Wuhan: China University of Geosciences Press, 1998.
[18]	Jahn B M, Cornichet J, Cong B L, et al. Ultrahigh-εNd-eclogites from an ultrahigh-pressure metamorphic terrane of China[J]. Chemical Geology, 1996, 127: 61-79. doi: 10.1016/0009-2541(95)00108-5
[19]	McCulloch M T, Gamble J A. Geochemical and geodynamical constraints on subduction zone magmatism[J]. Earth and Planetary Science Letters, 1991, 102: 358-374. doi: 10.1016/0012-821X(91)90029-H
[20]	Stalder R, Foley S F, Brey G P, et al. Mineral-aqueous fluid partitioning of trace elements at 900-1 200 ℃ and 3.0-5. 0 GPa: new experimental data for garnet, clinopyroxene and rutile, and implications for mantle metasomatism[J]. Geochimica et Cosmochimica Acta, 1998, 62: 1781-1801. doi: 10.1016/S0016-7037(98)00101-X