Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust

Shutian Suo; Zengqiu Zhong; Hanwen Zhou; Zhendong You; Li Zhang

doi:10.1007/s12583-012-0295-9

Volume 23 Issue 6

Dec 2012

Turn off MathJax

Article Contents

Journal of Earth Science > 2012 > 23(6): 775-785.

Shutian Suo, Zengqiu Zhong, Hanwen Zhou, Zhendong You, Li Zhang. Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust. Journal of Earth Science, 2012, 23(6): 775-785. doi: 10.1007/s12583-012-0295-9

Citation:

Shutian Suo, Zengqiu Zhong, Hanwen Zhou, Zhendong You, Li Zhang. Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust. Journal of Earth Science, 2012, 23(6): 775-785. doi: 10.1007/s12583-012-0295-9

Citation:

Shutian Suo, Zengqiu Zhong, Hanwen Zhou, Zhendong You, Li Zhang. Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust. Journal of Earth Science, 2012, 23(6): 775-785. doi: 10.1007/s12583-012-0295-9

PDF( 1143 KB)

Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust

doi: 10.1007/s12583-012-0295-9

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geociences, Wuhan 430074, China
Faculty of Earth Sciences, China University of Geociences, Wuhan 430074, China

Funds:

the National Natural Science Foundation of China 40372094

the National Natural Science Foundation of China 49972067

More Information

Corresponding author: Zengqiu Zhong, zqzhong@cug.edu.cn
Received Date: 10 May 2012
Accepted Date: 08 Jun 2012
Publish Date: 01 Dec 2012

Abstract

Abstract

Two fresh types of eclogites, namely the massive eclogite and foliated eclogite, are discernible in large eclogite bodies surrounded by country rock gneisses from the Dabie (大别)-Sulu (苏鲁) UHP metamorphic zone. They are different in mineral assemblage, texture and structure at various scales. The massive eclogite has a massive appearance with a metamorphic inequigranular and granoblastic texture, which consists mainly of nominally anhydrous minerals such as garnet, omphacite, rutile with inclusions of coesite and rare microdiamond. Massive eclogites which formed at the peak UHP metamorphic conditions (~3.1–4.0 GPa, 800±50 ℃) within the coesite to diamond stability field recorded the deep continental subduction to mantle depths greater than 100 km during the Triassic (~250–230 Ma). The diagnostic UHP minerals, mineral assemblages and absence of notable macroscopic deformation indicate the peak metamorphic' forbidden-zone' P-T conditions, an extremely low geothermal gradient (≤7 ℃·km⁻¹) and low differential stress. The foliated eclogite is composed of garnet+omphacite+rutile+phengite+kyanite+zoisite+talc+nyböite±coesite/quartz pseudomorphs after coesite. It is quite clear that the foliated eclogite bears relatively abundant hydrous mineral, and shows well-developed penetrative foliation carrying mineral and stretching lineation reflecting intense plastic deformation or flow of eclogite minerals. The foliated eclogite occurred at mantle levels and recorded the earliest stages of exhumation of UHP metamorphic rocks. At a map scale, the foliated eclogites define UHP eclogite-facies shear zones or high-strain zones. Asymmetric structures are abundant in the zones, implying bulk plane strain or dominant non-coaxial deformation within the coesite stability field. The earliest stages of exhumation, from mantle depths to the Moho or mantle-crust boundary layering, were characterized by a sub-vertical tectonic wedge extrusion, which occurred around 230-210 Ma. The three-dimensional relationship between the massive and foliated eclogites is well displayed a typical 'block-in-matrix' rheological fabric pattern indicating the partitioning of deformation and metamorphism in the UHP petrotectonic unit. The existing data support the now widely accepted concept of deep continental subduction/collision and subsequent exhumation between the Yangtze and Sino-Korean cratons. The pressure is a constitutive geological variable. The influence of tectonic overpresure on UHP metamorphism is rather limited.
- Dabie-Sulu UHP belt,
- massive eclogite,
- foliated eclogite,
- subduction,
- exhumation,
- differential stress,
- partitioning of deformation and metamorphism,
- rheology

FullText(HTML)

References(42)

References

Ames, L., Zhou, G. Z., Xiong, B. C., 1996. Geochronology and Isotopic Character of Ultrahigh-Pressure Metamorphism with Implications for Collision of the Sino-Korean and Yangtze Cratons, Central China. Tectonics, 15(2): 472–489, doi: 10.1029/95TC02552

Berthé, D., Choukroune, P., Jegouzo, P., 1979. Orthogneiss, Mylonite and on Coaxial Deformation of Granites: The Example of the South Armorican Shear Zone. Journal of Structural Geology, 1(1): 31–42, doi: 10.1016/0191-8141(79)90019-1

Burg, J. P., 1999. Ductile Structures and Instabilities: Their Implication for Variscan Tectonics in the Ardennes. Tectonophysics, 309(1–4): 1–25, doi: 10.10.1016/soo40-1951(99)00129-8

Burov, E., Yamato, P., 2008. Continental Plate Collision, P-T-t-z Conditions and Unstable vs. Stable Plate Dynamics: Insights from Thermo-Mechnical Modelling. Lithos, 103(1–2): 178–204 http://www.cosis.net/members/meetings/abstracts/file.php/40/86471/jpdf/EGU2007-J-04901.pdf

Carswell, D. A., 1986. The Metamorphic Evolution of Mg-Cr Type Norwegian Garnet Peridotites. Lithos, 19(3–4): 279–297, doi: 10.1016/0024-4937(86)90028-9

Chavangnac, V., Jahn, B. M., 1996. Coesite-Bearing Eclogites from the Bixiling Complex, Dabie Mountains, China: Sm-Nd Ages, Geochemical Characteristics and Tectonic Implications. Chemical Geology, 133(1–4): 29–51, doi: 10.1016/s0009-2541(96)00068-X

Chopin, C., 2003. Ultrahigh-Pressure Metamorphism: Tracing Continental Crust into the Mantle. Earth and Planetary Science Letters, 212: 1–14, doi: 10.1016/soo12-821x(03)00261-9

Cong, B. L., Zhai, M. G., Carswell, D. A., et al., 1995. Petrogenesis of Ultrahigh-Pressure Rocks and Their Country Rocks at Shuanghe in Dabieshan, Central China. European Journal of Minaralogy, 7: 119–138 doi: 10.1127/ejm/7/1/0119

Gao, X. Y., Zheng, Y. F., Chen, Y., 2012. Dehydration Melting of Ultrahigh-Pressure Eclogite in Dabie Orogen: Evidence from Multiphase Solid Inclusions in Garnet. Journal of Metamorphic Geology, 30(2): 193–212 doi: 10.1111/j.1525-1314.2011.00962.x

Hacker, B. R., Wallis, S. R., Mcwilliams, M. O., et al., 2009. ⁴⁰Ar/³⁹Ar Constraints on the Tectonic History and Architecture of the Ultrahigh-Pressure Sulu Orogen. Journal of Metamorphic Geology, 27: 827–844, doi: 10.1111/j,1525-1314,2009.00840.x

Ji, S. C., Sarawatari, K., Mainprice, D., et al., 2003. Microstructures Petrofabrics and Seismic Properties of Ultrahigh-Pressure Eclogites from Sulu Region, China: Implications for Rheology of Subducted Continental Crust and Origin of Mantle Reflections. Tectonophysics, 370: 49–76, doi: 10.1016/S0040-1951(03)00177-X

Ji, S. C., Xu, Z. Q., Jin, Z. M., et al., 2010. On the Quartz-Coesite Transition. Science in China (Series D Earth Scienses), 40(7): 822–830 (in Chinese)

Jin, Z. M., Zhang, J. F., Green, H. W. Ⅱ, et al., 2001. Eclogite Rheology: Implications for Subducted Lithosphere. Geology, 29(8): 667–670, doi:10.1130/0091-7613(2001)029<0667: ERIFSL>2.0.co:25

Kretz, R., 1983. Symbols for Rock-Forming Minerals. American Mineralogist, 68: 277–279 http://petrology.oxfordjournals.org/cgi/ijlink?linkType=ABST&journalCode=gsammin&resid=68/1-2/277

Lenze, A., Stöckhert, B., 2007. Microfabrics of UHP Metamorphic Granites in the Dora Moura Massif, Western Alps—No Evidence of Deformation at Depth. Journal of Metamorphic Geology, 25: 461–475 doi: 10.1111/j.1525-1314.2007.00707.x

Li, S. G., Jagoupic, E., Chen, Y. Z., et al., 2000. Sm-Nd and Rb-Sr Isotopic Chronology and Cooling History of Ultrahigh Pressure Metamorphic Rocks and Their Country Rocks at Shuanghe in the Dabie Mountains, Central China. Geochimica et Cosmochimica Acta, 64(6): 1077–1093 doi: 10.1016/S0016-7037(99)00319-1

Li, Z. H., Gerya, T. V., Burg, G. P., 2010. Influence of Tectonic Overpressure on P-T Paths of HP-UHP Rocks in Continental Collision Zones: Thermomechanical Modelling. Journal of Metamorphic Geology, 18(1): 67–77 http://www.onacademic.com/detail/journal_1000034680732210_9cbc.html

Liou, J. G., Banno, S., Ernst, W. G., 1995. Ultrahigh-Pressure Metamorphism and Tectonics. The Island Arc, 4(4): 233–239, doi: 10.1111/j.1440-1738.1995.tb00146.x

Liou, J. G., Maruyama, S. M., Cong, B. L., 1998. Introduction to Geodynamics for High- and Ultrahigh-Pressure Metamorphism. The Island Arc, 7(1–2): 1–5, doi: 10.1046/j.1440-1738.1998.00182.X

Liu, D. Y., Jian, P., 2004. 243 Ma and 228 Ma Retrograde Events of the Shuanghe Jadeite, Eastern Dabie Mountains—SHRIMP Dating, Mineral Inclusions and Zircon REE Patterns. Acta Geologica Sinica, 78(2): 211–217 (in Chinese with English Abstract)

Liu, X. C., Wu, Y. B., Cao, S., et al., 2011. Zircon U-Pb and Hf Evidence for Coupled Subduction of Oceanic and Continental Crust during the Carboniferous in the Huwan Shear Zone, Western Dabie Orogen, Central China. Journal of Metamorphic Geology, 29(2): 233–249, doi: 10.1111/j.1525-1314.2010.00914.x

Liu, X. W., Jin, Z. M., Jin, S. Y., et al., 2005. Defference of Deformation Characteristics of Garnets from Two Types of Eclogites: Evidence from TEM Study. Acta Petrologica Sinica, 21(2): 411–420 (in Chinese with English Abstract)

Lü, G. X., Chen, J., Li, X. B., et al., 1999. The Formation Depth of Coesite-Bearing Eclogite, Dabie UHPM Zone, China. Chinese Science Bulletin, 44(5): 398–412 doi: 10.1007/BF02977876

Mancktelow, N. S., 2008. Tectonic Pressure: Theoretical Concepts and Modelled Examples. Lithos, 103(1–2): 149–177, doi: 10.1016/j.lithos.2007.09.013

Marayama, S., Liou, J. G., Zhang, R. Y., 1994. Tectonic Evolution of the Ultrahigh-Pressure (UHP) and High-Pressure (HP) Metamorphic Belts from Central China. The Island Arc, 3(2): 112–121, doi: 10.1111/j.1440-1738.1994.tb00099.x

Oh, C. W., Kim, S. W., Choi, S. G., et al., 2005. First Finding of Eclogite Facies Metamorphic Event in South Korea and Its Correlation with the Dabie-Sulu Collision Belt in China. The Journal of Geology, 113(2): 226–232 doi: 10.1086/427671

Okay, A. I., 1993. Petrology of a Diamond- and Coesite-Bearing Metamorphic Terrain, Dabie Shan, China. European Journal of Mineralogy, 5: 659–675 doi: 10.1127/ejm/5/4/0659

Palmeri, R., Frezzotti, M. L., Godard, G., et al., 2009. Pressure-Induced Incipient Amorphization of α-Quartz and Transition to Coesite in an Eclogite from Antarctica: A First Record and Some Consequences. Journal of Metamorphic Geology, 27(9): 685–705, doi:10.1111/j.1525-1314.2009. 00843.x

Petrini, K., Podladchikov, Y., 2000. Lithosphere-Depth Relationship in Compressive Regions of Thickened Crust. Journal of Metamorphic Geology, 18(1): 67–77 doi: 10.1046/j.1525-1314.2000.00240.x

Ree, J. H., Cho, M., Kwon, S. T., 1996. Possible Eastward Extension of Chinese Collsion Belt in South Korea: The Imjingang Belt. Geology, 24(12): 1071–1074, doi:10.1130/0091-7613(1996)024<1071:PEEOCF>2.3.Co;2

Stöckhert, B., Renner, J., 1998. Rheology of Crustal Rocks at Ultrahigh Pressure. In: Hacker, B. R., Liou, J. G., eds., When Continents Collide: Geodynamics and Geochemistry of Ultrahigh-Pressure Rocks. Kluwer Academic Publishers, Dordrecht. 57–95 http://link.springer.com/978-94-015-9050-1

Su, W. H., Liu, S., Xu, D. P., et al., 2006. A New Way of Transformation from α-Quartz to Coesite. Progress in Natural Science, 16(10): 1090–1097 doi: 10.1080/10020070612330115

Suo, S. T., Zhong, Z. Q., Zhou, H. W., et al., 2005. . Tectonic Evolution of the Dabie-Sulu UHP and HP Metamorphic Belts, East-Central China: Structural Record in UHP Rocks. International Geology Review, 47(11): 1207–1221, doi: 10.2747/0020-6814.47.11.1207

Suo, S. T., Zhong, Z. Q., Zhou, H. W., et al., 2009. Meso and Micro-Structures of Foliated Eclogites in Dabie-Sulu UHP Belt and Implications for the Earlist Stages of Exhumation of UHP Metamorphic Rocks: An Example from Taohang, Southern Shandong, China. Journal of Earth Science, 20(4): 649–658, doi:do] 10.1007/s12583-009-0057-5

Wang, L., Jin, Z. M., Kusky, T. M., et al., 2010. Microfabric Characteristics of Ultra-High-Pressure Metamorphosed Jadeite-Quartzite and Eclogite from Shuanghe, Dabie Mountains, China. Journal of Metamorphic Geology, 28(2): 163–182, doi: 10.1111/j.1525-1314.2009.00859.x

Xu, S. T., Su, W., Liu, Y. C., et al., 1992. Diamond from the Dabie Shan Metamorphic Rocks and Its Implication for the Tectonic Setting. Science, 256(5053): 80–82, doi: 10.1126/science,256.5053.80

Xu, Z. Q., Yang, W. C., Ji, S. C., et al., 2009. Deep Root of a Continent-Continent Collision: Evidence from the Chinese Continental Scientific Drilling (CCSD) Deep Borohole in the Sulu Ultrahigh Pressure (HP-UHP) Metamorphic Terrane, China. Tectonophysics, 475(2): 204–219 doi: 10.1016/j.tecto.2009.02.029

Yao, Y. P., Ye, K., Liu, J. B., et al., 2000. A Transitional Eclogite-to High Pressure Granulite-Facies Overprint on Coesite-Eclogite at Taohang in the Sulu Ultrahigh-Pressure Terrane, Eastern China. Lithos, 52(1–4): 109–120 http://www.sciencedirect.com/science/article/pii/s0024493799000870

Zhang, R. Y., Liou, J. G., 1998. Ultrahigh-Pressure Metamorphism of the Sulu Terrane, Eastern China: A Prospective View. Continental Dynamics, 3(1/2): 32–53, doi: 10.1029/2001GL014128

Zhang, R. Y., Liou, J. G., Cong, B. L., 1995. Talc-, Magnesite- and Ti-Clinohumite-Bearing Ultrahigh-Pressure Meta-Mafic and Ultramafic Complex in the Dabie Mountains, China. Journal of Petrology, 36(4): 1011–1037, doi: 10.1093/petrology/36.4.1011

Zhang, R. Y., Liou, J. G., Omori, S., et al., 2012. Tale of the Kulet Eclogite from the Kokchetav Massive, Kazakhstan: Initial Tectonic Setting and Transition from Amphibolite to Eclogite. Journal of Metamorphic Geology, 30(5): 537–559, doi: 10.1111/j.1525-1314.2012.00980.x

Zhong, Z. Q., Suo, S. T., Zhang, L., et al., 2007. Plastic Rheology of Rocks—A Structural Study on the Dabie-Sulu UHP and HP Metamorphic Belts. China University of Geosciences Press, Wuhan (in Chinese)

Relative Articles

Supplements(0)

Cited By

Proportional views

Proportional views

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Figures(7)

Get Citation

PDF

XML

Article Metrics

Article views(472) PDF downloads(31)

Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust

doi: 10.1007/s12583-012-0295-9

Abstract

References

Proportional views

Catalog

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related

Two Fresh Types of Eclogites in the Dabie-Sulu UHP Metamorphic Belt, China: Implications for the Deep Subduction and Earliest Stages of Exhumation of the Continental Crust

doi: 10.1007/s12583-012-0295-9

Abstract

References

Proportional views

Catalog

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related

Export File

Citation

Format

Content