Study of Serpentinized Ultramafic Rocks of Bela Ophiolite, Balochistan, Pakistan

Bashir, Erum; Naseem, Shahid; Kaleem, Maria; Khan, Yousuf Aziz

doi:10.5539/jgg.v4n1p79

Cited by 3 publications

(4 citation statements)

References 30 publications

(35 reference statements)

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“…These findings are consistent with previous research [16,20]. The high concentration of Mn in stream sediments is attributable to factors such as Bela ultramafic sequence mobility, weathering, and serpentinization [11].…”

Section: Analysis and Discussionsupporting

confidence: 93%

“…The sequence offers promising prospects for metalliferous mineral enrichment, such as Fe, Cu, Au, Ag, Cu, Pb, Zn, Ni, and Cr [7][8][9][10]. The ophiolite succession in Pakistan was formed on the Neotethys ocean floor before the Late Cretaceous collision of the Eurasian-Indian plate [11,12]. The succession has been reported in several locations throughout Pakistan, ranging from the Karakorum-Himalaya region in the north to the Lasbela district in the south [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…According to studies, BOC has the high economic potential of Fe, Mn, Ti, Cr, Ni, Co, Zn, and Pb [13,[16][17][18][19][20]. The mafic and ultramafic sequences, aided by the BOC tectonic regime, demarcate economic potential host spots for metallogenic minerals [11,17,21]. Narejo et al (2019) and Ali (1971) postulated hydrothermal Mn deposits of volcanogenic sedimentary origin, proposing a study that includes detailed deposit descriptions using a combination of geological and geophysical approaches [18,20].…”

Section: Introductionmentioning

confidence: 99%

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Metallic-Mineral Prospecting Using Integrated Geophysical and Geochemical Techniques: A Case Study from the Bela Ophiolitic Complex, Baluchistan, Pakistan

et al. 2022

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An integrated geophysical and geochemical investigation was conducted to investigate the metallic minerals hosted in the mafic and ultramafic rocks in the Bela Ophiolitic Complex. Two thousand magnetic observations were made along with six vertical electrical soundings, with Induced Polarization (IP) targeting the anomalous magnetic zones. The magnetic raw field data were interpreted qualitatively and quantitatively, and two anomalous zones (A1 and A2) were identified on the magnetic maps. The residual magnetic values in the high-magnetic-anomalous zone (A2) ranged from 310 nT to 550 nT, while the magnetic signatures in the low-magnetic zone (A1) ranged from –190 nT to 50 nT. The high-anomalous zone (A2) was distinguished by a high IP value ranging from 3.5 mV/V to 15.1 mV/V and a low apparent and true resistivity signature of 50 ohm·m. Whereas, the low-anomalous zone (A1) was distinguished by very low IP values ranging from 0.78 mV/V to 4.1 mV/V and a very high apparent and true resistivity of 100 ohm·m. The Euler deconvolution was used to determine the depth of the promising zone, which for A1 and A2 was in the 100 m range. The statistical analysis was carried out using hierarchical classification to distinguish between background and anomalous data. The high-magnetic anomalous signature of probable mineralization was in the range of 46,181 nT–46,628 nT, with a total intensity range of 783 nT–1166 nT. The major and trace-element analysis of the 22 rock and stream sediments collected from the high-magnetic-anomalous zone confirmed the mineralization type. The geomagnetic and geophysical cross sections revealed that anomalous mineralization was concentrated with the anticlinal Bela Ophiolitic Complex. The generated results also aided in the identification of rock boundaries, depth, and hidden faults in the area. The findings revealed that the study area has excellent mineralization associated with the ultramafic-rock sequence.

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Section: Analysis and Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metallic-Mineral Prospecting Using Integrated Geophysical and Geochemical Techniques: A Case Study from the Bela Ophiolitic Complex, Baluchistan, Pakistan

et al. 2022

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“…The Mg# values (Mg# = 100 × Mg/(Mg + Fe)) of the serpentinite samples are high and define a very narrow interval (90.1-92.7). Based on the element mobilization analysis, the metamorphism was close to isochemical because the LOI values and SiO 2 /MgO ratios are not correlated (Bashir et al 2012). Due to this assumption the slope of the isocon is 1.…”

Section: Gyód Serpentinitementioning

confidence: 99%

Petrologic comparison of the Gyód and Helesfa serpentinite bodies (Tisia Mega Unit, SW Hungary)

Kovács¹,

Radovics²,

Tóth³

2016

J. Geosci.

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Magnetic anomalies in the south-western part of the Tisia Mega Unit were drilled in different geological situations: the Helesfa serpentinite body is surrounded by a Variscan granite, while the host rocks of the Gyód serpentinite body are paragneiss and amphibolite. Nevertheless, these anomalies are on opposite sides of the Mecsekalja Shear Zone, which developed during the Variscan Orogeny. Olivine, enstatite and spinel occur as relicts in the Gyód serpentinite, while the primary ultramafic rock of the Helesfa serpentinite is totally serpentinized. Based on the major-element whole-rock geochemical data, the protolith of the two serpentinites was mainly harzburgite. Based on the similar petrography, textures, mineral composition, major-element geochemistry, as well as metamorphic and structural evolution, a close genetic relationship between the Gyód and Helesfa serpentinite bodies can be supposed. Serpentinite with pseudomorphous lizardite and chrysotile textures possibly formed during the ocean-floor metamorphism. Afterwards, an antigorite ± talc assemblage developed from the pseudomorphous serpentine texture, which is sheared and mylonitized, supposedly due to subduction. Serpentinites with similar composition and evolution are widespread in the Bohemian Massif (especially in the Polish Central-Sudetic ophiolites).Keywords: serpentinite, harzburgite, websterite, Alpine-type ophiolite, Tisia, Variscides Received: 5 March, 2016; accepted: 30 September, 2016; handling editor: E. Jelínek magnetic, aeromagnetic and aero-gamma surveys, small local anomalies were recorded, which were drilled by exploration boreholes in some cases. In this way, the Gyód serpentinite (GS) and Helesfa serpentinite (HS) bodies were recognized in the crystalline basement of SW Tisia Mega Unit (Fülöp 1994). During geological exploration, a third, Ófalu serpentinite body (OS) was identified (Ghoneim and Ravasz-Baranyai 1969).The early petrographic and geochemical analyses (Ghoneim and Ravasz-Baranyai 1969;Erdélyi 1974;Szederkényi 1974Szederkényi , 1976bSzederkényi , 1977Szederkényi and Grasselly 1977; Ghoneim 1978;Jantsky 1979;Ghoneim and Szederkényi 1979;Svingor and Kovách 1981;Balla 1981Balla , 1983Balla , 1985Papp 1989) led to different opinions regarding the protoliths, metamorphic evolution and genesis of the two serpentinite bodies. Petrographic, mineralogical and geochemical comparison of the Gyód and Helesfa serpentinites, based on the available drill cores, is presented in this work. A detailed evaluation of the likely protoliths, metamorphic evolution as well as deformation history of both bodies may serve as a firm basis to delineate a uniform evolution scheme for the study area. In the future, this approach would provide data for comparisons with other serpentinite bodies in the vicinity and thus the Tisia Mega Unit's evolution.

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Trace Element Geochemistry of Groundwater of Winder, Balochistan, Pakistan and its Appraisal for Irrigation Water Quality

Naseem¹,

Bashir²,

Pirzada³

et al. 2013

BJAST

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Study of Serpentinized Ultramafic Rocks of Bela Ophiolite, Balochistan, Pakistan

Cited by 3 publications

References 30 publications

Metallic-Mineral Prospecting Using Integrated Geophysical and Geochemical Techniques: A Case Study from the Bela Ophiolitic Complex, Baluchistan, Pakistan

Metallic-Mineral Prospecting Using Integrated Geophysical and Geochemical Techniques: A Case Study from the Bela Ophiolitic Complex, Baluchistan, Pakistan

Petrologic comparison of the Gyód and Helesfa serpentinite bodies (Tisia Mega Unit, SW Hungary)

Trace Element Geochemistry of Groundwater of Winder, Balochistan, Pakistan and its Appraisal for Irrigation Water Quality

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