MINERAL PARAGENESIS, A KEY IN DETERMINATION OF PHYSICO-CHEMICAL CONDITIONS OF SKARNIFICATION, A CASE STUDY, MOHAMMAD-ABAD DISTRICT, SW YAZD PROVINCE

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MOORE F.; SHARIFI R.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2010 | Volume:18 | Issue:1 Page(s): 147-160

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Title

MINERAL PARAGENESIS, A KEY IN DETERMINATION OF PHYSICO-CHEMICAL CONDITIONS OF SKARNIFICATION, A CASE STUDY, MOHAMMAD-ABAD DISTRICT, SW YAZD PROVINCE

Author(s)

MOORE F. | SHARIFI R. | Issue Writer Certificate

Keywords

ENDOSKARNQ3

EXOSKARNQ3

METASOMATICQ2

PROGRADE ALTERATIONQ3

RETROGRADE ALTERATIONQ3

Abstract

Mineralogical and geochemical investigations indicate two general stages of skarnification i.e, prograde and retrograde stages in the Mohammad-Abad district, south west of Yazd province. METASOMATIC skarn (Prograde stage) occurred with precipitation of anhydrous calc-silicate mineral assemblages (andradite and diopside-hedenbergite) within the temperature ranges of 470 to 550oC. During the retrograde stage (<470oC) considerable amounts of anhydrous calc-silicates were altered and replaced by a series of hydrous calc-silicates (epidote, tremolite–actinolite). Finally, both anhydrous and hydrous calc-silicates were altered to fine aggregates of chlorite, calcite, quartz and clay minerals at temperatures lower than 300 oC. The absence of wollastonite among the calc-silicate assemblages may suggest that andradite and hedenbergite were crystallized from metasomatizing fluids at lower than 550 oC in the Mohammad-Abad skarn. The presence of intergrowth texture and non-replacive crystal boundaries between garnets and pyroxenes suggest that they were formed contemporaneously within the temperature and fO2 ranges of 430–550oC and 10-26–10-23, respectively. Andradite converted to quartz, calcite and magnetite below 470 oC and fO2=10-24–10-21. Since, both magnetite and pyrite along with quartz and calcite are present in mineral assemblages of sub-stage III, it can be reasoned that the metasomatizing fluids probably had an approximate fS2 10-6.5 and a temperature of about 430 oC.

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APA: Copy

MOORE, F., & SHARIFI, R.. (2010). MINERAL PARAGENESIS, A KEY IN DETERMINATION OF PHYSICO-CHEMICAL CONDITIONS OF SKARNIFICATION, A CASE STUDY, MOHAMMAD-ABAD DISTRICT, SW YAZD PROVINCE. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 18(1), 147-160. SID. https://sid.ir/paper/4239/en

Vancouver: Copy

MOORE F., SHARIFI R.. MINERAL PARAGENESIS, A KEY IN DETERMINATION OF PHYSICO-CHEMICAL CONDITIONS OF SKARNIFICATION, A CASE STUDY, MOHAMMAD-ABAD DISTRICT, SW YAZD PROVINCE. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2010;18(1):147-160. Available from: https://sid.ir/paper/4239/en

IEEE: Copy

F. MOORE, and R. SHARIFI, “MINERAL PARAGENESIS, A KEY IN DETERMINATION OF PHYSICO-CHEMICAL CONDITIONS OF SKARNIFICATION, A CASE STUDY, MOHAMMAD-ABAD DISTRICT, SW YAZD PROVINCE,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 18, no. 1, pp. 147–160, 2010, [Online]. Available: https://sid.ir/paper/4239/en

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