Petrologi - geokimia batuan Gunung Api Tampomas dan sekitarnya

Mesker H. Dirk


Volcanic rocks of Mount Tampomas and its surroundings belong to low–K, calc–alkaline, and high–K series of basalt, basaltic andesite, and andesite suites containing 48.59 – 60.49 wt% of SiO and 0.31-1.67 wt% of K O. The rocks are typically formed in an island arc environment characterized by the high content of Al O (16.47 – 21.76 wt%), low to moderate content of MgO (2.37 – 8.84 wt%), low content of both titanium TiO (< 1 wt%) and high field strength elements (HFSEs), negative anomaly of Nb relative to K and La. The light rare earth elements (LREEs) enrichment but low abundances of heavy rare earth elements (HREEs) indicate fractionation process. The parent magma was an extensive removal of olivine and clino-pyroxene, plagioclase, apatite, and titanoferrousmagnetite from a basalt olivine magma of N-MORB character that was firstly enriched by LILEs such as Ba, Rb, Th, K, and LREE (La). The differentiation lasted, and the magma became water undersaturated at the crystallization phase of hornblende. The high content of incompatible elements such as Ba, Th, La, Ce, may indicate contamination by liquid derived from the subducted slab.




petrology; geochemistry; volcanic rocks; Mount Tampomas; picrite magma; N-MORB mantle


Arculus, R.J. dan Powell, R., 1986. Source component mixing in the regions of arc magma generation. Jour. Geophys. Res., 91, h. 5913-5926.

Bronto, S. 2006. Fasies gunung api dan aplikasinya. Jurnal Geologi Indonesia, 2, h. 59 – 71.

Brophy, J.G., 1986. Cold Bay volcanic centre, Aleutian volcanic arc. Contrib. Mineral. Petrol., 93, h. 368-380.

Brophy, J.G. dan Marsh, B.D., 1986. On the origin of high alumina arc basalt and the mechanics of melt extraction. Jour. Petrol., 27, h. 763- 789.

Crawford, A.J., Fallon, T. J. dan Eggins, S., 1987. The origin of island arc high alumina basalts. Contrib. Mineral. Petrol., 109, h. 479- 493.

Davidson, J.P., 1987. Crustal contamination versus subduction zone enrichment: Examples from the Lesser Antiles and implications for mantle source compositions of island arc volcanic rocks. Geochem. Cosmochim. Acta, 51, h. 2185-2198.

Eggins, S.M., 1993. Origin and differentiation of picritic arc magmas, Ambae (Aoba), Vanuatu. Contrib. Mineral. Petrol., 114, h. 79-100.

Foden, J.D. dan Green, D.H., 1992. Possible role of amphibole in the origin of andesite: Some experimental and natural evidence. Contrib. Mineral. Petrol., 109, h. 479- 493.

Green, D.H. dan Ringwood A.E., 1967. The genesis of basaltic magma. Contrib. Mineral. Petrol., 1, h. 103 – 190.

Grove, T.L. dan Kinzler, R.J., 1986. Petrogenesis of andesites. Ann. Rev. Earth Planet. Sci. Let., 14, h. 417-454.

Hartono, U., 1995. The major, trace, rare earth element geochemistry of the Lawu Volcano, Central Jawa. Jour. Geol Min Res., 50, h. 12-29.

Johnston, A.D., 1986. Anhydrous P – T relations of near primary high-alumina basalt from the South Sandwich Islands. Contrib. Mineral. Petrol., 92, h. 368 – 382.

Martodjojo, S., 2003. Evolusi Cekungan Bogor Jawa Barat, ITB, Bandung. Thesis Doktor, tidak dipublikasikan, 238 h.

Miyashiro, A., 1974. Volcanic rocks series in island arcs and active continental margins. Amer. Jour. Sci., 274, h. 321 - 355.

Morries, J. D. dan Hart, S.R., 1983. Isotopic and incompatible element constraints on the genesis of island arc volcanics from Cold Bay and Amak island, Aleutians, and implications for mantle structure. Geochim. Cosmochim. Acta, 47, h. 2015-2930.

Myers, J.D., Frost, C.D., dan Angevine, C. L., 1986a. A test of quartz eclogite source for parental Aleutian magmas: A mash balance approach. Jour. Geology, 94, h. 811 – 828.

Myers, J.D., Marsh, B.D., dan Sinha, A.K., 1986b. Geochemical and strontium isotop characteristics of parental Aleutian arc magmas: evidence from the basaltic lava of Atka. Contrib. Mineral. Petrol., 94, h. 1 - 11.

Nicholls, I.A. dan Ringwood, A.E., 1973. Effect of water on olivine stability in tholeiites and the production of silica-saturated magmas in the island arc environment. Jour. Geol. Soc. London., 81, h. 285 – 300.

Norries, K., dan Chappel. B.W., 1967. X-Ray fluorescent spectrography. Dalam: Zussman J. (Ed.), Physical methods in determinative mineralogy, Academic Press, London, h. 161 - 214.

Pearce, J. A. dan Norry, M. J., 1979. Petrogenetic Implications of Ti, Zr, Y, and Nb variations in Volcanic Rocks. Contrib. Mineral. Petrol., 69, h. 33 – 47.

Peccerillo, A. dan Taylor, S.R., 1976. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastomonu area Northern Turkey. Contrib. Min. Petrol., 58, h. 63 – 81.

Perfit, Mr. R., Gast, D. A., Bence, A. E., Arculus R. J., dan Taylor, S. R., 1980. Chemical characteristics of island arc basalts: Implication for mantle sources. Chemical Geol., 30, h. 227 - 256.

Reagan, M.K. dan Gill, G.B., 1989. Coexisting calc-alkaline and high niobium basalts from Tirralba volcano, Costa Rica: Implications for residual titanites in arc magma source. Jour. Geophy. Res., 94 (B), h. 4619-4633.

Ringwood, A.E., 1977. Petrogenesis in island arc systems. Dalam: Talwani, M. and Pitman III, W, C. (eds), Island arcs, deep sea trenches and back-arc basin. Am. Geophys. Union, h. 311-324.

Silitonga, P.H., 2003. Peta Geologi Lembar Bandung, Jawa, skala 1:100.000. Direkt. Geologi, Bandung.

Silitonga, P.H., Masria, M., dan Suwarna, N., 1996. Peta Geologi Lembar Cirebon, Jawa, skala 1:100.000. Puslitbang Geologi, Bandung.

Soeriaatmadja, R., Maury, R. C., Bellon, H., Pringgoprawiro, H., dan Priadi, B., 1994. Tertiary Magmatic belts in Java. Jour. SE Asian Earth Sci. 9, h. 13-22.

Sun, S. S., dan McDonough, 1989. Chemical and isotopic systematics of oceanic basalt: implications for mantle composition and processes, Dalam: Saunders, A. D., and Norry, M. J., (eds). Magmatism in the ocean basins. Geol. Soc. Spec. Publ., 42, h. 313-345.

Tatsumi, Y., Hamilton, D.L., dan Nesbitt, R.W., 1986. Chemical characteristics of fluid phase released from a subducted lithosphere and origin of arc magmas: Evidence from high-pressure experiments and natural rocks. Jour. Vol. Geotherm. Res., 29, h. 293-309.

Thorpe, R.S. dan Francis., 1979. Petrogenetic relationship of volcanic and intrusive rocks of the Andes. Dalam: Atherton , M.P. dan Tarney, J. (eds), Origin of Granite Batholiths Geochemical Evidence, h. 65-75.

Yoder, H. Z., and Tilley, C. E., 1962. Origin of basalt magmas: An experimental study of natural and synthetic rock system. Jour. Petrol., 3, h. 342-532.

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