Composition, structure and fluid regime of differentiated porphyritic intrusion Magnitogorsk iron-ore deposit (Southern Urals)
Autor: | T. D. Bocharnikova, V. V. Holodnov, E. S. Shagalov, E. V. Konovalova |
---|---|
Jazyk: | English<br />Russian |
Rok vydání: | 2016 |
Předmět: |
магнитогорское скарново-магнетитовое месторождение
геохимия петрология флюиды галогены дифференциация рудообразование минералы апатит magnitogorsk skarn-magnetite deposits geochemistry petrology fluids halogens differentiation ore-formation minerals apatite Engineering geology. Rock mechanics. Soil mechanics. Underground construction TA703-712 |
Zdroj: | Литосфера, Vol 0, Iss 4, Pp 54-78 (2016) |
Druh dokumentu: | article |
ISSN: | 1681-9004 2500-302X |
Popis: | Case study of the differentiated subvolcanic porphyritic intrusion underlying Magnitogorsk skarn-magnetite deposit revealed regular relations between petrochemistry features of the rocks and composition of halogens (Cl and F) in the accessory apatite. During the process of intrusion formation in terms of general trend of differentiation from the pyroxene-porphyrites its base to atachites (trachyandesites, phonotephrites) its upper part, several autonomous fluid-magmatic systems (FMS), which differ in major and trace elements distribution as well as halogen composition in apatites, are formed. In the uppermost part of the atachite section, mostly saturated by alkalis and volatile components, through a further fluid-magmatic stratification were formed two atachite strata: sodium, enriched in Na, Ca, Sr, and with a higher Cl content in apatite and potassium “ore-bearing” located at a higher hypsometric level and enriched in K, Rb, Fe, V, Ti, P, with a higher content of F in apatite. Formation of subvolcanic intrusion was accompanied by repeated occurrences of explosive phenomena. These data indicate the features of magmatism in Magnitogorsk megazone in D3-C1, at the change the island-arc stage by accretionary-collision (island arc-continent) one |
Databáze: | Directory of Open Access Journals |
Externí odkaz: |
načítá se...