GEOCHEMISTRY AND TECTONIC SETTING OF BASALTIC LAVAS IN DEH-SARD AREA, SOUTH OF KERMAN: IMPLICATIONS FOR MELTING AND ENRICHMENT PROCESSES IN AN “OFF-AXIS” ENVIRONMENT

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MAHDAVI N.S.; ARVIN M.

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Journal: GEOSCIENCES Year:2004 | Volume:12 | Issue:53 Page(s): 88-99

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Title

GEOCHEMISTRY AND TECTONIC SETTING OF BASALTIC LAVAS IN DEH-SARD AREA, SOUTH OF KERMAN: IMPLICATIONS FOR MELTING AND ENRICHMENT PROCESSES IN AN “OFF-AXIS” ENVIRONMENT

Author(s)

MAHDAVI N.S. | ARVIN M. | Issue Writer Certificate

Keywords

DEH- SARDQ4

TRANSITIONAL BASALTQ4

SUBDUCTION ZONEQ2

OFF AXISQ4

WITHIN PLATEQ3

Abstract

The upper Jurassic to lower Cretaceous volcano-sedimentary rocks of Deh-Sard is located in southern part of Sanandaj- Sirjan zone in southern Kerman. It consists of intermittent lava flows (mainly basalt, basaltic-andesite and trachy-basaltic-andesite), pyroclastics (various types of tuffs and bereccias) and sedimentary rocks (limestones and shales).The Deh-Sard basalts composed essentially of plagioclase and clinopyroxene microphenocrysts, set in a matrix of same mineralogy along with opaque and apatite as accessory minerals. The existence of disequilibrium textures in Deh-Sard basalts reveal the rapid changes in the pressure of rising magma.The pyroclastic rocks mainly of crystal litic tuffs, are less common and consists of plagioclases, basaltic-andesites and trachy-basalt-andesites. Lihtologicaly the sedimentary rocks belong to a shallow marine environment. The Deh-sard basalts shows an enrichment in low ionic potential elements (eg., K, Rb, Sr, Ba, Th) and moderate abundances in high ionic potential elements (eg., Nb, Ce, P, Y, Cr) relative to N-type MORB. Based on geochemical data, trace and REE element diagrams the Deh-Sard basalts have characteristics of transitional tholeiitic basalt.The geochemical patterns of the Deh-Sard basalt, normalized to MORB and chonderite, define a pattern more akin to that of basalt from SUBDUCTION ZONE in an active continental margin and also to WITHIN PLATE basalt. However creation of a rift type environment in a transitional continental- oceanic crust “off-axis” from the spreading center for the formation of Deh Sard basalt can be also contemplated.In such an “off-axis” environment magmas do not show chemical characteristics of magmas delivered to the axial system, but resemble to those in seamount-type volcanism.

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APA: Copy

MAHDAVI, N.S., & ARVIN, M.. (2004). GEOCHEMISTRY AND TECTONIC SETTING OF BASALTIC LAVAS IN DEH-SARD AREA, SOUTH OF KERMAN: IMPLICATIONS FOR MELTING AND ENRICHMENT PROCESSES IN AN “OFF-AXIS” ENVIRONMENT. GEOSCIENCES, 12(53), 88-99. SID. https://sid.ir/paper/32532/en

Vancouver: Copy

MAHDAVI N.S., ARVIN M.. GEOCHEMISTRY AND TECTONIC SETTING OF BASALTIC LAVAS IN DEH-SARD AREA, SOUTH OF KERMAN: IMPLICATIONS FOR MELTING AND ENRICHMENT PROCESSES IN AN “OFF-AXIS” ENVIRONMENT. GEOSCIENCES[Internet]. 2004;12(53):88-99. Available from: https://sid.ir/paper/32532/en

IEEE: Copy

N.S. MAHDAVI, and M. ARVIN, “GEOCHEMISTRY AND TECTONIC SETTING OF BASALTIC LAVAS IN DEH-SARD AREA, SOUTH OF KERMAN: IMPLICATIONS FOR MELTING AND ENRICHMENT PROCESSES IN AN “OFF-AXIS” ENVIRONMENT,” GEOSCIENCES, vol. 12, no. 53, pp. 88–99, 2004, [Online]. Available: https://sid.ir/paper/32532/en

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