Figure 3 - uploaded by Haider Zaman
Content may be subject to copyright.
Geological map of the Yasin-Gupis area in NE Kohistan. Samples from the Sandhi, Yasin, and Baris localities (16 sites) are used for this study.
Source publication
To identify remanence-carrying magnetic minerals and document their thermochemical behavior, detailed rock magnetic investigations were conducted on Cretaceous-Tertiary rocks collected from northwestern and northeastern Kohistan, northern Pakistan. Rock magnetic results from each area are clearly differentiated on the basis of site location. Detrit...
Similar publications
The increased aridification of Central Asia during the Miocene coincides in time with lake formations and the evolution of playa environments in the region. However, Miocene continental climate dynamics and the forcing of aridification are still not well constrained. Neogene lacustrine mudflat deposits in the Ili Basin in southeast Kazakhstan provi...
The North Pacific Ocean (NPO) has received abundant aeolian dust transported by westerlies from the Asian inland. The aeolian components preserved in NPO sediments record information on palaeoclimatic and palaeoenvironmental changes in Asian source areas at different timescales. Previous studies have systematically investigated the source–sink effe...
In order to study the rotations of crustal material along the boundary faults in the southeastern Tibetan Plateau, and to better understand the tectonic evolution of this region, in this study we conducted a paleomagnetic study of Cretaceous red beds in the Binchuan and Xiangyun sections near the Chenghai‐Binchuan fault, a branch fault at the north...
Ocean Drilling Program Hole 896A was drilled 1 km southeast of the ODP deep-basement Hole 504B, 200 km south of the Costa Rica Rift. The magnetic properties (intensity of remanence, bulk susceptibility, inclination of stable remanence, and median destructive field) of 166 minicores from Hole 896A are presented. The basement in Hole 896A can be divi...
The northeastern margin of North China Craton is located in an active area of tectonic movement. Paleomagnetic study can provide a basis record for tectonic evolution and magmatic thermal events. 246 samples were collected from 32 mining sites of the Middle Cambrian in Huinan area, Jilin Province, for petrology, rock magnetism and systematic therma...
Citations
... The Kaldom Gol area in the north-western part of Kohistan Island Arc, Pakistan (Fig. 1A, B) is well-known for hosting polymetallic (Cu-Sb-Pb) quartz vein mineralization in the metavolcanics rocks of the Gawuch Formation (Tahirkheli et al., 2005;Tahirkheli et al., 2012;Farhan et al., 2021b). The Cretaceous Gawuch Formation comprises variably metamorphosed sedimentary (quartzite and marble) and basalt to andesitic volcanic rocks that host Eocene (~42 Ma) polymetallic quartz veins (Tahirkheli et al., 2012;Zaman and Bamousa, 2015). The primary minerals in metavolcanic rocks are plagioclase, amphibole and quartz; secondary minerals include chlorite, epidote, and trace amounts of clay (illite/sericite). ...
The Cu-Sb-Pb polymetallic vein deposit is hosted by metavolcanics rocks of the Gawuch Formation at the Kaldom Gol area of the northwest Kohistan arc terrain in northern Pakistan. The mineralization is closely associated with the dioritic to granodioritic rocks of the Lowari pluton, which was intruded into the Gawuch metavolcanics. Details of ore characterization and processes of ore genesis of this evidently hydrothermal mineralization are not well documented. Integrating petrographic, mineral-chemical and isotopic investigations, this study aims to comprehend the source of hydrothermal fluids, geochemical evolution, mineral inclusions and physicochemical conditions of the Cu-Sb-Pb polymetallic vein deposit in Gawuch metavolcanics in the Kohistan arc terrain in northern Pakistan. The mineralization is distinguished into three types of ore-gangue associations: Type Ia, Type Ib, and Type II. The textural study revealed two pyrite generations: (i) Py1 displaying euhedral to subhedral habits and containing scarce inclusions, and (ii) Py2 occurring as anhedral grains hosting abundant inclusions. Type Ia is characterized by Py1 associated with abundant quartz (Qz) showing comb texture, sericite (Ser), and minor chlorite (Chl). Type Ib comprises Qz + Ser + Chl and Py2, chalcopyrite (Ccp), and magnetite (Mag). Type II is represented by mosaic quartz, rhombic adularia, and bladed calcite, and the ore minerals fahlore and galena. Alteration zones composed of Qz-Ser ± Chl and Qz-Ser-Chl, surround Type I (a, b) and Type II veins, respectively. Fahlore and galena mostly replace pyrite of Type Ia and chalcopyrite of Type Ib. In addition, malachite, azurite, hematite and covellite occur as secondary (supergene) minerals. The Co/Ni ratios (>1) of Kaldom Gol pyrites suggest that the ore-forming fluids were hydrothermal in origin and Py1 and Py2 solidified at 221–304 °C and 225–261 °C, respectively. The LA-ICP-MS time-resolved depth profiles confirm the existence of sphalerite, and chalcopyrite inclusions in pyrite (Py1 and Py2) and millerite, bravoite, vaesite, Au-tellurides, native Au and galena inclusions in chalcopyrite and fahlore. Sulfur isotope compositions of pyrites (δ34S = Py1, −0.58 to +2 ‰; δ34S = Py2, −0.24 to +2.04 ‰) indicate that the ore-forming fluids were derived from magmatic source (s). The mineral assemblage, hydrothermal alterations, textures, temperature and δ34S of pyrites suggest that the Cu-Sb-Pb polymetallic mineralization at Kaldom Gol represents an intermediate-sulfidation type of epithermal deposit.
... Most likely these rocks are associated with ultramafic/mafic igneous or metamorphic origin (Jelinek 1981). The Mali-Dera region is dominated by volcanic and plutonic igneous rocks with many dikes and sills filled with hydrothermal fluid (Fig. 3) (Zaman and Bamousa 2015). ...
Chromite deposits have long been reported and exploited in Northern Pakistan as a result of the ongoing convergence of Indian and Asian plates. This research work is a study of one such prospect. We used geophysical and geochemical tools such as magnetic susceptibility at seventy-seven observation stations along with fifteen rock samples collected for geochemical studies. Our geochemical analysis reveals a very high value of Fe, Mn, Cu, and Ni in regions of high magnetic susceptibility indicating the possibility of the presence of Magnetite, Chondrite, Copper-pyrites, and Pentlandite Ores. In addition, we also conducted the correlations analysis to investigate the potential association between various geochemical variables including trace elements to evaluate the potential of the ores for economic minerals others than chromite. Our PCs analysis result presents a clear picture that most of the minerals such as Fe, Ni, Co, Cd, Mg, Mn, and Pd are produced by the same source. Our various analyses are in perfect agreement with previous literature indicating the presence of economical mining of Chromite.
... The age of regional metamorphism (80-60 Ma) in the Eastern Karakoram is also consistent with late Cretaceous accretion of the KLA with the KB (Borneman et al., 2015;Heuberger, 2004). Similarly, Paleomagnetic studies in northern Pakistan also support Cretaceous accretion between the KLA and KB (Zaman and Bamousa, 2015;Zaman and Torii, 1999). ...
The northernmost exposures of sub-Himalayan Cenozoic strata in the Hazara–Kashmir syntaxial region of north Pakistan comprises the Paleocene–Eocene marine strata in the lower part and Oligocene–Miocene nonmarine strata in the upper part. This study provides the detrital zircon U–Pb geochronology of the Cenozoic strata in this area. The strong resemblance of U–Pb age spectra of Paleocene Hangu, Lockhart and Patala formations with those of Himalayan strata indicate an Indian plate provenance. The first appearance of <100Ma detrital zircon U–Pb ages within the lower most part of the Early EoceneMargalla Hill Limestone indicates a shift from an Indian to Asian provenance. Geologic mapping shows the existence of a disconformity between the lower and upper most part of the Patala Formation, which is interpreted to have been formed by the migration of a flexural forebulge through this region. We consider the upper most part of the Patala Formation to have been deposited within the distal foredeep of the foreland basin. The Indian to Asian provenance shift and the presence of a possible foreland basin forebulge provide strong evidence that India–Asia collision was underway in northern Pakistan at ca. 56–55Ma.
