PETROLOGY OF THE MAKSYUTOV ECLOGITE-BLUESCHIST COMPLEX,SOUTHERN URALS
Received date: 2000-08-15
Revised date: 2000-10-12
Online published: 2001-04-01
The Maksyutov complex is a part of Precambrian foldbelt extending from the Urals,North Karakum,Kunlun,Qilian,Qinling to the Dabie Sulu belt of eastern China. In Maksyutov the eclogites present as single blocks and boudines embedded within the glaucophane and micaceous schists. Due to the Phanerozoic multi phase granite intrusions and their resulting superposed metamorphism the data on the age of eclogite are diverse spanning from Early Proterozoic to Lower Paleozoic. The mineral composition of the eclogite are constant with garnet, omphacite and rutile,however, they are often replaced by metamorphic assemblages of epidote blueschist facies. The garnets are iron rich with f=50%~75%. Clinopyroxenes are omphacites Jd 40.3~52.2. According to the garnet clinopyroxene geothermometry and Jadeite +quartz→albite geobarometry T=1060~686℃,P=22.3×105~14.16×105 kPa are estimated. The PT trajectory of Maksyutov eclogite corresponds to the upward intrusion of eclogite magma, the final consolidation of the eclogites probably took place in the lower crust.
Key words： Eclogite; Blueschist; Petrology; Mineralogy; Maksyutov complex; Asia.
A.A.Marakushev, A.V.Bobrov, V.G.Butvina,SANG Long-kang, LIU Rong . PETROLOGY OF THE MAKSYUTOV ECLOGITE-BLUESCHIST COMPLEX,SOUTHERN URALS[J]. Advances in Earth Science, 2001 , 16(2) : 147 -152 . DOI: 10.11867/j.issn.1001-8166.2001.02.0147
[1] Dobretsov N L,Shatsky V S,Coleman R.G,et al. Tectonic setting and petrology of ultrahigh-pressure metamorphic rocks in the Maksyutov Complex, Ural Mountains, Russia[J].Int Geol Rev,1996,38:136~160.
[2] Miyashiro A.Paired and unpaired metamorphic belts[J].Tectonophysics, 1973, 17:241~254.
[3] Valizer P M,Lennykh V I.Amphiboles of blueschists of the Urals[M]. Moscow:Nauka, 1988.(in Russian).
[4] Lennykh V I.Eclogite-blueschist belt of the Southern Urals[M].Moscow:Nauka,1977.(in Russian).
[5] Bulanova G P,Barashkov Yu P,Tal' nikova S B,et al.Natural Diamond-Genetic Aspecls [M]. Novosibirsk: Vo“Nauka”,1993.(in Russian).
[6] Chesnokov B V, Popov V A. Increasing volumeof quartz grains in eclogites of the southern Urals[J]. Trans Acad Sci, 1965,162:176~178(in Russian).
[7] Leech M L,Ernst W G. Graphite pseudomorphs after diamond? A carbon isotope and spectroscopic study of graphite cuboids from the Maksyutov Complex,south Ural mountains,Russia[J]. Geochim Cosmochim Acta, 1998,62(12):2 143~2 154.
[8] Marakushev A A, Sang Longkang, Bobrov A V,et al. Asian eclogite diamondiferous foldbelt[J]. Pacific Geology, 2000,19(1), 3~36(in Russian).
[9] Marakushev A A, Paneyakh N A, Zotov I A,et al. Heterogeneous nature of diamondiferous metamorphic complexes of Kokchetav block, Kazakhstan, and Dabie Shan, China[J].Earth Science Frontiers, 1998,5(3):39~49.
[10] Marakushev A A, Sang Longkang, Paneyakh N A,et al. Genesis of eclogite-blueschist formations on the example of Dabieshan (China) [J]. Izv Russian Acad of Natural Sci,1999,2:63~78(in Russian).
[11] Sobolev V S, Sobolev N V, Larent' evYu.G. Inclusions in diamond from diamondiferous eclogite Trans [J]. Acad Sci, 1972, 207(1):164~166(in Russian).
[12] Meyer H O A, Boctor N Z.Sulfide-oxide minerals in eclogite from Stockdale kimberlite, Kansas [ J]. Contrib Mineral Petrol,1975,52:57~68.
[13] Garanin V K, Kudryavtseva G P, Khar' kiv A D. New variety of eclogites in kimberlites of Yakutia[J]. Trans Acad Sci,1982,262(6):1 450~1 455(in Russian).
[14] Krooh E J. The gamet-clinopyroxene Fe-Mg geothermometer-a reinterpretation of existing experimental data[J]. Contrib Mineral Petroly,1998,99:44~48.
[15] Perchuk A.L.New variant of omphacite-albite-quartz barometer with regard to structural states of omphacite and albite. Trans Acad Sci, 1992, 316:1 286~1 289 (in Russian).
/
| 〈 |
|
〉 |
甘公网安备62010202000687
