Ring structures and copper mineralization in Kerman porphyry copper belt, SE Iran

Document Type : Research Article

Authors

• Gholamreza Mirzababaei
• Jamshid Shahabpour

Shahid Bahonar University of Kerman

10.22067/econg.v4i2.16498

Abstract

The role of some ring structures in the distribution of porphyry copper deposits in south Kerman porphyry copper belt is discussed. In the study area, ring structures are circular or elliptical shaped features which are partly recognized on satellite images. In this study, Landsat multispectral images were used to identify ring structures in the area. The rudimentary identification stages of the circles were mainly based on their circular characteristics on the images. These structures match with the regional tectonic features and can be seen mainly in two types; namely, large-magnitude and small scale circles. The associated mineralization in the study area is mainly porphyry Cu and vein type base metal sulfide deposits. There is a sensible relationship between the large circles and mineralization. These circles have encompassed almost entire Cu deposits and prospects in south part of Kerman porphyry copper belt. The small circles seem to be external traces of (porphyritic) intrusive bodies that appear on surface as small circles. Formation of the large circular structures do not appear to be related to the external processes and there is no clear indication of how they came into existence but, their arrangement around the edges of a positive residual anomaly area shows the probable role of this anomaly in their formation. This matter is also recognized on the generalized crustal thickness map of the region in which an updoming of the upper mantle is observed. This study can improve our collective knowledge for copper exploration in this region.

Keywords

• Kerman porphyry copper belt
• ring structures
• mineralization
• residual anomaly

20.1001.1.20087306.1391.4.2.8.1

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References

[1] Saul J. M., "Circular structures of large scale and great age on the Earths surface", Nature 271(1978) 345-349.

[2] Eggers A. J., " Large-scale circular features in North Westland and West Nelson, New Zealand: possible structural control for porphyry molybdenum-copper mineralization?", ECON.GEOL 74 (1979) 1490-1494.

[3] Witschard F., "Large-magnitude ring structures on the Baltic shield-metallogenic significance" ECON.GEOL 79 (1984) 1400-1405.

[4] StÖcklin J., "Possible ancient continental margins in Iran. In: Burk, C.A., Drake. C.L. (Eds), the Geology of Continental Margins", Springer-Verlag, Berlin (1974) 873-887.

[5] Farhoudi G. H., " A comparison of Zagros geology to island-arcs", Journal of Geology 86 (1978) 323-334.

[6] Shahabpour J., Kramers J. D., "Lead isotope data from the Sar Cheshmeh porphyry copper deposit, Kerman, I.R. Iran", Mineralium Deposita 22(1987) 278-281.

[7] Dimitrijevic M. D., "Geology of Kerman region", Geol. Surv. Iran., Rep 52 (1973) 334.

[8] Berberian M., Yasini A.,. "Variations, facies extent and the principal guidelines of the paleogeography in Iran (in Persian). In: M. Berberian Continental deformation in Iranian plateau", GSI, Report 52, (1983) 72-73.

[9] Berberian M., "Generalized tectonic map of Iran", Geological Survey of Iran, Report 52 (1983).

[10] Hassanzadeh J., "Metallogenic and tectonomagmatic events in the SE sector of the Cenozoic active continental margin of Iran (Shahr e Babak area Kerman province)", Unpublished Ph.D thesis, University of California, Los Angeles (1993) 204p.

[11] Amini A., "Sandstone petrofacies expressions of source and tectonic controls on sedimentation in a back-arc basin, Central Iran", Iranian International Journal of science 3 (2002) 43-67.

[12] Shahabpour J., "Island arc affinity of the Central Iranian Volcanic Belt", J Asian Earth science 30 (2007) 652-665.

[13] Shahabpour J., "The role of deep structures in the distribution of some major ore deposits in Iran, NE of the Zagros thrust zone", Journal of Geodynamics 28 (1999) 237-250.

[14] Smith R. L., Baily R. A., "Resurgent cauldrons", Geol. Soc. America, Mem 116 (1968) 613-662.