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TECTONIC INTERRELATIONSHIP BETWEEN KHUNZDAR REGION AND SUBMARINE ARABIAN SEA STRUCTURES AND THEIR ECONOMIC POTENTIALS

Hisamuddin, Noushaba (2004) TECTONIC INTERRELATIONSHIP BETWEEN KHUNZDAR REGION AND SUBMARINE ARABIAN SEA STRUCTURES AND THEIR ECONOMIC POTENTIALS. PhD thesis, University of Karachi, Karachi.

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Abstract

The geological setting of Pakistan is unique and characterizes tectonic junctions of different interactive plates and micro plates within an area of about 800,000 sq km comprising of large fold-thrust belt transversed by numerous complex and significant geological anomalous trends and structures. Khuzdar Knot, the study area, is one of such anomalous features transversing the north-south oriented axial-fold-thrust belt of Pakistan. Likewise the offshore region of Pakistan has enigmatic crustal features A number of hypotheses and models were proposed by the geoscientists from time to time to explain the formation of Khuzdar Knot, the structures exposed in its surrounding areas and the offshore submarine crustal features mainly based on the surface geological and geomorphological expressions The present integrated geophysical studies comprising of seismicity, gravity and magnetic techniques supplemented by the available geological data have unearthed the surface and the subsurface tectonic interrelationship among the Khuzdar & its surrounding areas and the submarine features, i.e., Murray Ridge, Owen Fracture Zone etc. These studies have also delineated the deep-seated structures within the basement and their ongoing tectonic activities and relevant processes responsible for the tailoring of tectonic pictures of the Khuzdar & its surrounding areas and the bottom of the Arabian Sea. Ridge, Owen Fracture Zone etc. These studies have also delineated the deep-seated structures within the basement and their ongoing tectonic activities and relevant processes responsible for the tailoring of tectonic pictures of the Khuzdar & its surrounding areas and the bottom of the Arabian Sea. Moreover, the study has also revealed new prospects for the hydrocarbon and mineralized horizons, their tectonic associations and selection of priority areas for the future research and exploration activities Integration of the geophysical and geological data have revealed the east-west actuate structural trend in Khuzdar and surrounding areas, which appears as the results of the transcurrent movement associated with the southern Indus basin fossil rift under the influence of the ongoing anticlockwise rotational movement of the Indo-Pakistan continental plate. This transcurrent zone changes its orientation towards south-west, which is manifested at the surface as the drag effects of the east-west oriented Makran flysch mountain ranges towards north-east. The gravity and the seismic analyses show that the transcurrent zone has left lateral deformational trend, which is creeping in space and time towards Makran coast and segmenting the Arabian oceanic plate Gravity modeling shows an imbricate oblique transcurrent fault system passing across the Khuzdar area and causes crustal shortening within the narrow zone, which appears to develop regional duplex structures favorable for the hydrocarbon accumulation. A number of Pb-Zn-barite mineralization associated with the deformed structures indicates the complete structural control for the mineral occurrences Tensor analyses of earthquake events occurred in Panjgur-Kharan basin reveal the presence of a rift basin, which has been first time identified by the gravity data analyses. The presence of this structure indicates the northward migration of Chagai volcanic are and change in the angle of western segment of the Arabian oceanic plate. The rift basin seems to be the potential structure for the hydrocarbon accumulation and as well as for the deposition of antimony, mercury gold etc. minerals in traces most probably similar to Andaman rift basin Seismic data have one of the right lateral transform fault of Carlsberg spreading ridge center, which is abnormally extending northward in the alignment of Khuzdar-NAI-Jabri transcurrent zone. It is expected that these two transcurrent-transform land and the sea features will join together in near future geological time On the eastern side of the Owen Fracture Zone, the Murray Ridge complex has been revealed as a rift basin, which most probably seems to continue in the north-east direction and joins with the Indus fossil rift structural basin. The magnetic data show that the little Murray Ridge structure corresponds with the Khuzdar-Bela ophiolite zone exposed on the land. Its is also inferred that due to the re-activation of Indus basin rift structure, the intensity of the deformation of ophiolite zone increases from sea to landward The integrated models based on the results of the present study now clearly demonstrate the distribution and direction of domains of the tectonic forces in and around the study area. Moreover, these models have also established the interrelationship among the surface and the deep-seated deformed structures vertically and as well as laterally, which provides guidelines for the exploration of oil & gas and the various mineral potentials

Item Type:Thesis (PhD)
Uncontrolled Keywords:khunzdar region, submarine arabian sea structures, crustal features, southern indus basin, indo-pakistan continental plate, mineralization, seismicity, khuzdar knot
Subjects:Physical Sciences (f) > Earth Sciences(f4) > Geology, (f4.1)
ID Code:1082
Deposited By:Mr. Muhammad Asif
Deposited On:19 Feb 2007
Last Modified:05 Oct 2010 12:48

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