PECULIARITIES OF DISTRIBUTION, COMPOSITION AND ORIGIN OF GLAUCOPHANE FROM DABIE-SHAN (CHINA)
Keywords:
glaucophane, blue schists, high- and ultrahigh pressure, petrogenesis, isotopes of O and C, Upper Proterozoic, Dabie-Shan, China.Abstract
Peculiarities of distribution of glaucophane in the Precambrian rocks of the Dabie-Shan area (China) and its composition are described. Glaucophane is the main mineral of the Upper Proterozoic Mulanshan–Zhangbaking blue schist belt. Glaucophane is un-evenly distributed in the leucocratic rocks of the belt, and in melanocratic units it is concentrated in glaucophane schists. Appearance of glaucophane is determined by pri-mary composition of initial rocks. Chemical composition of glaucophane from the blue schists belts in different regions and from the Dabie-Shan region is similar, but with some local variations. Isotopic composition of C and O from the different types of car-bonates is variable, but in general it indicates the absence of large-scale processes of re-crystallization with participation of mobile CO2. Main characteristics of investigated rocks and minerals are connected with initial composition of the rocks.
References
Bushmin S. A. The scheme of mineral facies of metamorphic rocks / S. A. Bush-min, V. A. Glebovitsky // Zapiski RMO (Proceedings of the Russian Mineralogi-cal Society). – 2008. – Pt. 137, N 2. – P. 1–15. (in Russian)
Bushmin S. A. Scheme of mineral facies of metamorphic rocks and its application to the Fennoscandian Shield with representative sites of orogenic gold mineralization / S. A. Bushmin, V. A. Glebovitsky // Transactions of Karelian Research Centre of Russian Academy of Sciences. – 2015. – December. – P. 1–25. (in Rus-sian)
Carbon isotopic anomaly in marbles associated with eclogites from the Dabie Mountains in China / Zheng Y. F., Fu B., Gong B., Wang Z. // J. of Geol. – 1998. – Vol. 106, N 1. – P. 97–104.
Dobretsov N. L. Glaucofane schist and eclogite-glaucofane schist complexes of USSR / N. L. Dobretsov // Proceedings of the IGG SO AN SSSR. – 1974. – Vol. 57. – 426 p. (in Russian)
Dobretsov N. L. Glaucophane schists and eclogites in the folded systems of north-ern Asia / M. L. Dobretsov, N. V. Sobolev // Ofioliti. – 1984. – Vol. 9. – P. 401–423. (in Russian)
Dobrzhinetskaya L. F. Frontiers of ultrahigh-pressure metamorphism: view from field and laboratory / L. F. Dobrzhinetskaya // Ultrahigh-Pressure Metamorphism: 25 Years after the Discovery of Coesite and Diamond / [Ed. by L. F. Dobrzhinet-skaya, S. W. Faryad, S. Wallis et al.]. – London : Elsevier, 2011. – P. 1–39.
Dobrzhinetskaya L. F. Microdiamonds – Frontier of ultrahigh-pressure metamor-phism. A review / L. F. Dobrzhinetskaya // Gondwana Research. – 2012. – Vol. 21. – P. 207–223.
Dobrzhinetskaya L. F. Nanometric inclusions of carbonates in Kokchetav dia-monds from Kazakhstan: A new constraint for the depth of metamorphic diamond crystallization / L. F. Dobrzhinetskaya, R. Wirth, H. W. Green II // Earth and Planet. Sci. Letters. – 2006. – Vol. 243. – P. 85–93.
El-Shazly A. K. Interlayered eclogites, blueschists and epidote amphibolites from NE Oman: a record of protolith compositional control and limited fluid infiltra-tion / A. K. El-Shazly, M. A Worthing, J. G. Liou // J. of Petrol. – 1997. – Vol. 38, N 11. – P. 1461–1487.
Eskola P. The mineral facies of rocks / P. Eskola // Norsk Geologisk Tidsskrift. – 1920. – Vol. 6. – P. 143–194.
Guliy V. N. Carbon and oxygen isotopic composition of carbonates from Precam-brian apatite-bearing carbonate rocks of the Aldan shield / V. N. Guliy, H. Wa- da // Lithology and Minerals Resources. – 2004. – Vol. 39, N 3. – P. 243–253.
Letnikov F. A. Formation of diamonds within deap-seated tectonic zones / F. A. Letnikov // Doklady Academii Nauk SSSR (Proceeding of USSR Academy of Sciences). – 1983. – Vol. 371. – P. 433–435. (in Russian)
Leypunskiy O. I. On synthetic diamonds / O. I. Leypunskiy // Uspekhi Khimii (Progress Chemical). – 1939. – Vol. 8, N 10. – P. 1519–1534. (in Russian)
Low δ18O eclogites from the Kokchetav massif, northern Kazakhstan // H. Ma-sago, D. Rumble, W. G. Ernst [et al.] // J. Metamorphic Geol. – 2003. – N 21. – P. 579–587.
Microdiamond in high-grade metamorphic rocks of the Western Gneiss region, Norway / L. F. Dobrzhinetskaya, E. A. Eide, R. B. Larsen [et al.] // Geology. – 1995. – Vol. 23, N 7. – P. 597–600.
New genetic type of diamond deposits / L. D. Lavrova, V. A. Pechnikov, A. M. Pleshakov [et al.] // Science World. – Moscow, 1999. – 228 p. (in Russian)
Nomenclature of amphiboles: report of the Subcommittee on amphiboles and mineral names of the International Mineralogical Association (CNMMN IMA) / B. E. Leake, R. Woolley, W. D. Birch [et al.] // Zapiski RMO (Proceedings of the Russian Mineralogical Society). – 1997. – Pt. 137, N 6. – P. 82–102.
Okay A. I. Petrology of diamond and coesite-bearing metamorphic terrain Dabie Shan, China/ A. I. Okay // Eur. J. Mineral. – 1993. – Vol. 5. – P. 659–675.
Oxygen and hydrogen isotope geochemistry of gneisses associated with ultrahigh pressure eclogites at Shuanghe in the Dabie Mountains / Fu B., Zheng Y. F., Wang Z. [et al.] // Contrib. Mineral. Petrol. – 1999. – N 34. – P. 52–66.
Phase equilibria and metamorphic evolution of glaucophane-bearing UHP ec-logites from the Western Dabieshan Terrane, Central China / Wei C. J., Li Y. J., Yu Y., Zhang J. S. // J. Metamorphic Geol. – 2010 – Vol. 28. – P. 647–666.
Rozen O. M. Diamond occurrence related to eclogite in Precambrian of Kok-chetav massif / O. M. Rozen, Y. M. Zorin // Doklady Academii Nauk SSSR (Pro-ceeding of USSR Academy of Sciences). – 1972. – Vol. 203. – P. 674–676. (in Russian)
Ruiz-Cruz M. D. Geochemical signatures and inclusions in apatite as markers of a hidden ultrahigh-pressure event (Betic Cordillera, Spain) / M. D. Ruiz-Cruz, C. Sanz de Galdeano, A. Santamara // J. of Geol. – 2016. – Vol. 124, N 3. – P. 277–292.
Sang L. The petrochemistry of the Lower Proterozoic rocks from the Dabieshan–Lyianynggang area, the South Eastern margin of the North China Platform / Sang L. // Precambrian Res. – 1991. – Vol. 39. – P. 65–76.
Shumilova T. G. Mineralogy of native carbon / T. G. Shumilova. – Ekaterinburg : UB RAS, 2003. – 315 p. (in Russian)
Zhang R. Y. Coesite inclusions in dolomite from eclogite in the southern Dabie Mountains,China: The significance of carbonate minerals in UHPM rocks / Zhang R. Y., Liou J. G. // Amer. Mineral. – 1996. – Vol. 81. – P. 181–186.
