Abstract
The three I-type plutons of Guantian (GT), Guidong (GD), Shangbao (SB) and the two S-type plutons of Xucun (XC) and Xiuning (XN) as well as their microgranitoid enclaves in southern China have been studied. Restite in the Motianling (MT) metasomatic granite in this area is described in this paper as well. Microgranitoid enclaves in the I-type granitoids may be divided into autoliths and schlierens which have marked differences both in petrography and geochemistry. In the S-type granitoids, schlierens are the major microgranitoid enclaves, but autoliths are rare. The metasomatic granite contains only restite without other enclaves. The microgranitoid enclaves and their host rocks have close εNd (T) values and the same minerals within them are similar in composition. The microgranitoid enclaves, in general, don’t represent the products of mixing of the syn-plutonic foreign mafic magma and the host acidic magma. They are the records of the evolution of intermediate-acidic magma itself. The formation of autoliths is related to the interdiffusion of different constituents in magma. Schlierens are the products of immiscible fractionation of the magma.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bacon, C. R., 1986, Magmatic inclusions in silicic and intermediate volcanic rocks: Journal of Geophysical Research, v. 91, p. 6091–6122.
Bateman, P. C., L. D. Clark, N. K. Huber, J. G. Moore, and C. D. Rinehort, 1963, The Sierra Nevada batholith—a synthesis of recent work across the Central Part: United States Geological Survey Professional Paper, 414-D, p. 1–46.
Cantagrel, J. M., J. Didier, and A. Gourgaud, 1984, Magma mixing: origin of intermediate rocks and “enclaves” from volcanism to plutonism: Physics of the Earth and Planetary Interiors, v. 35, p. 63–76.
Chappel, B. W., A. J.R. White, and D. Wyborn, 1987, The importance of residual source material (restite) in granite petrogenesis: Journal of Petrology, v. 28, p. 1111–1138.
Chen, Y. D., R. C. Price, and A. J. R. White, 1989, Inclusions in three S-type granites from southeastern Australia: Journal of Petrology, v. 30, p. 1181–1218.
Didier, J., 1982, The problem of enclaves in granitic rocks, a review of recent ideas on their origin, in Geology of Granites and Their Metallogenic Relations: The Proceedings of International Symposium, Nanjing, China, p. 137 – 144.
Eberz, G. W., I. A. Nicholls, R. Mass, M. T. McCulloch, and D. J. Whitford, 1990, The Nd− and Sr− isotopic composition of I-type microgranitoid enclaves and their host rocks from the Swifts Creek pluton, Southeast Australia: Chemical Geology, v. 85, p. 119–134.
Eichelberger, J. C., 1978, Andesitic volcanism and crustal evolution: Nature, v. 275, p. 21–27.
Eichelberger, J. C., 1980, Vesiculation of mafic magma during replenishment of silicic magma reservoirs: Nature, v. 288, p. 446–450.
Furman, T. and F. J. Spera, 1985, Co-mingling of acid and basic magmas with implication for the origin of mafic I-type xenoliths: field and petrochemical relations of an unusual dike complex at Eagle Lake, Sequoia National Park, California, USA: Journal of Volcanology Geothermal Research, v. 24, p. 151–178.
Hess, P. C., 1977, Structure of silicate melt: Canadian Mineralogist, v. 15, p. 162–178.
Holden, P., A. N. Halliday, and W. E. Stephens, 1987, Neodynium and strontium isotope content of microdiorite enclaves points to mantle input to granitoid production: Nature, v. 330, p. 53–56.
Institute of Geochemistry, Academia Sinica, 1979, Geochemistry of Granitoids in South China: Beijing, Science Press (in Chinese).
Kistler, R. W., B. W. Chappell, and D. L. Peck, 1986, Isotopic variations in the Tuolumne intrusive Suite, Central Sierra Nevada, California: Contributions to Mineralogy and Petrology, v. 94, p. 205–220.
Li Xianhua, 1991, Geochronology of Wanyanshan-Zhuguangshan granitoid batholith: implication for the crust development: Science in China, v. 34, p. 620–629.
Miller, C. F., 1985, Are strongly peraluminous magmas derived from pelitic sedimentary source? Journal of Geology, v. 93, p. 673–689.
Mysen, B. O., D. Virgo, and F. A. Seifert, 1982, The structure of silicate melt, implication for chemical and physical properties of natural magmas: Reviews of Geophysics and Space Physics, v. 20, p. 353–383.
Phillips, G. N., V. J. Wall, and J. D. Clemens, 1981, Petrology of the Strathbogie batholith: a cordierite-bearing granite: Canadian Mineralogist, v. 19, p. 47–64.
Pin, C., J. L. Duthou, and J. D. Clemens, 1988, Origin of microgranular enclaves in granitoids: equivocal Sr-Nd isotopic evidence: EOS. Transactions, American Geophysical Union, v. 44, p. 1505. (abstract)
Poli, G. E. and S. Tommasini, 1991, Model for the origin and significance of microgranular enclaves in calc alkaline granitoids: Journal of Petrology, v. 32, p. 657–666.
Presnall, D. C. and P. C. Bateman, 1973, Fusion relations in the system NaAlSi3O8-CaAl2Si2O8-KAlSi3O8-SiO2 H2O and generation of granitic magmas in the Sierra Navada batholith: Bulletin of the Geological Society of American, v. 84, p. 3181–3201.
Reid, J. B. Jr., O. C. Evans, and D.G. Fates, 1983, Magma mixing in granitic rocks of the Central Sierra Nevada, California: Earth and Planetary Science Letters, v. 66, p. 243–261.
Sparks, R. S. J., H. Sigurdson, and L. Wilson, 1977, Magma mixing: a mechanism for triggering acid explosive eruptions: Nature, v. 267, p. 315–318.
Stout, J. H., 1972, Phase petrology and mineral chemistry of coexisting amphiboles from Telemark, Norway: Journal of Petrology, v. 13, p. 99–145.
The Granitoid Research Group under the Nanling Project, MGMR, 1989, Geology of granitoids of the Nanling region and their petrogenesis and mineralization: Geological Memoris, Ministry of Geology and Mineral Resources, PRC, Series 3, No. 10, Beijing, Geological Publishing House (in Chinese with English abstract).
Vernon, R. H., 1984, Microgranitoid enclaves in granites—globules of hybid magma quenched in a plutonic environment: Nature, v. 309, p. 438–439.
Walker, D. and S. E. Delong, 1982, Soret separation of Mid-Ocean Ridge basalt magma: Contributions to Mineralogy and Petrology, v. 79, p. 231–240.
Wang Yinxi, Yang Jiedong, Tao Xiancong and Li Huimin, 1988, A study of the Sm-Nd method for fossil mineral rocks and its application: Journal of Nanjing University (Natural Science Edition), v. 24, p. 297–308 (in Chinese with English abstract).
White, A. J. R. and B. W. Chappell, 1977, Ultrametamorphism and granitoid genesis: Tectonophysics: v. 43, p. 7–22.
Zhou Jincheng and Xu Xisheng, 1992, Microgranitoid enclaves and related diffusion and liquid immiscibility of magmas: Geological Review, v. 38, p. 197–209 (in Chinese with English abstract).
Zhou Xinmin and Wang Dezi, 1988, The peraluminous granodiorites with low initial87Sr/86Sr ratio and their genesis in southern Anhui Province, eastern China: Acta Petrologica Sinica, n. 3, p. 37–45 (in Chinese with English abstract).
Author information
Authors and Affiliations
Additional information
This project was financially supported by the National Natural Science Foundation of China.
Rights and permissions
About this article
Cite this article
Zhou, J., Xu, X. & Xiancong, T. Microgranitoid enclaves in some I- and S-type granites from southern China. Chin. J. of Geochem. 13, 24–38 (1994). https://doi.org/10.1007/BF02870853
Issue Date:
DOI: https://doi.org/10.1007/BF02870853