Basalts In Afghanistan

Basalte en Afghanistan

basalts in afghanistan. basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in colour, and comparatively rich in iron and magnesium. Some basalts are quite glassy (tachylytes), …

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Mineralogical Characteristics of Sapphire-Bearing Placers …

Abstract The paper presents the results of a comparative analysis of sapphire-bearing placers in South Primorye (Shkotovo Plateau, Russia) and in the adjacent Heilongjiang Province (the Muling deposit, China). The placers are confined to intraplate alkali basalts with similar geochemical characteristics and age. It was found that the same minerals from placers …

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Late Triassic back-arc spreading and initial opening of the …

The studied basalts form layers of volcanic lava around 0.5–1.5 m thick in the upper part of the Nieru Formation (Fig. 3 a, b). The basalts are interbedded with dark gray mudstones, slates, siltstones, and limestones. The basalts are dark gray in colour and have a fine-grained texture and massive structure (Fig. 3 c–e). They show a slight ...

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Petrogenesis of Carboniferous adakites and Nb-enriched arc basalts …

The fields of the island arc basalts and NEB are from Kepezhinskas et al. (1996). The field of the Luotuogou and Tuwu Carboniferous basalts is constructed using data from the following sources: Xia et al., 2004b; unpublished data of Q. Wang. Data sources for the igneous rocks in the Alataw area are the same as in Fig. 4.

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Major transition of continental basalts in the Early …

There is increasing evidence that the subcontinental lithospheric mantle is dynamic, as indicated by changes in its thickness and containing components with varying geochemical and isotopic compositions through time (Farmer, 2014 and references therein).Continental basalts provide direct clues for the evolution of continental lithosphere and …

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Geology of Corundum and Emerald Gem …

All of the Oligocene to Pliocene ages (40–5 Ma) are consistent with compressional tectonic events that were active in the ruby-bearing metamorphic belt from Afghanistan to Vietnam. The fourth period of corundum …

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Wrangellia flood basalts in Alaska: A record of …

The arc lithosphere is a key suspect for derivation of the low-titanium basalts because (1) the geochemical and isotopic signature of the low-titanium basalts has very similar characteristics to rocks formed in subduction settings [e.g., Kelemen et al., 2003]; (2) arc crust is exposed beneath the Nikolai basalts in Alaska; and (3) the low ...

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The geology and petrography of the ultramafic rocks at …

Tur Ghar occupies the northeastern side of Kandahar city and some parts of ShawaliKot and Daman Districts. Such Cretaceous volcanogenic formation containing Hematite veins, fan …

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basalts in afghanistan

In this study, we conduct detailed mineralogy, petrology and isotopic geochemistry on the Meso-Cenozoic alkaline basalts from the Tuoyun Basin in the western CAOB, which are exposed …

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The Largest Standing Stupa in Afghanistan: A short history …

A dome-shaped ancient Buddhist shrine, the Topdara stupa to the north of Kabul was described by 19 th century British explorer Charles Masson as "perhaps the most complete and beautiful monument of the kind in these countries." Since Masson's visit in 1833, the Topdara stupa saw few visitors and had fallen into neglect until recently, in 2016, when an Afghan …

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Geological and Geochemical Studies of Flood Basalts (Aiba …

The study area, Maychew, is located in the northern eastern corner of the northwestern Ethiopian plateau. Petrological, petrographic, and geochemical (trace and major elements) data are presented and integrated for Maychew flood basalts to characterize the geochemistry and constrain petrogenetic processes involved in the evolution of these flood basalts.

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Late Paleozoic Rifting in northern Pakistan

Postrifting thermal subsidence led to the deposition of Upper Triassic marine carbonate rocks which unconformably overlie the rift basalts. A similar tectonic history in central Afghanistan suggests continuity between the two regions prior to the opening of the Neo-Tethys.

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Zinc and iron isotopic compositions of Cenozoic basalts in …

These basalts, together with Wulanhada and Siziwangqi basalts reported in this study, constitute a SW-NE profile. Basalts distributed in this profile have similarly high δ 66 Zn values, indicating that the amounts of recycled carbonate in their sources are similar. In other words, this profile is nearly vertical to the subducted direction of ...

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Melting in an Archaean mantle plume: heads it's basalts, …

of basalts and komatiites (-15 Myr)22; and the horizontal length-scale of the 2.7-Gyr crustal anatectic event (1,000 km)22• The apparently short time interval for komatiite eruption sug­ ...

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Evidence for the Occurrence of Permian Panjal Trap Basalts …

It could be shown there, that flood basalts can spread over distances of hundred kilometers away from their center of eruption Permian Panjal Trap Basalts in NE Pakistan 605 (Schmincke 1967). Typical for flood basalts is their lateral uniformity in chemical composition, a fact which can be used for correlations of individual lava flows between ...

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Recycled oceanic crust in the source of 90–40 Ma basalts in …

Major, trace element and Sr–Nd–Pb isotopic data of basalts emplaced during 90–40 Ma in the North and Northeast China are compiled in this review, with aims of constraining their petrogenesis, and by inference the evolution of the North China Craton during the late Cretaceous and early Cenozoic.Three major components are identified in magma source, …

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6 US Military Bases in Afghanistan | MilitaryBases

It is actually the Forward Operating Base of the United States Marine Corps in Afghanistan. This FOB in Afghanistan is located along the 2,000 km. in Afghanistan's Delaram District. Ring Road is Afghanistan's main thorough fare with numerous qualities of …

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a) Simplified tectonic sketch map of the Iranian-Afghan …

Saccani et al. (2022) have shown that metabasalts are represented by three geochemically distinct protoliths, including sub-alkaline basalts showing either N-MORB or E-MORB compositions and ...

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The geology and petrography of the ultramafic …

Tur Ghar occupies the northeastern side of Kandahar city and some parts of ShawaliKot and Daman Districts. Such Cretaceous volcanogenic formation containing Hematite veins, fan alluvium foothills,...

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Age, geochemical characteristics and petrogenesis of Late …

Miocene to Quaternary alkali basalts in the Lut–Sistan region, eastern Iran are spatially associated with two active, N–S-trending dextral strike–slip fault systems in the region, i.e., the Neh faults in the Sistan suture zone and the Nayband fault ~ 200 km further to the west in the Lut block.Here, we present new 40 Ar/ 39 Ar ages, geochemical and Sr–Nd isotopic data …

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Geospatial Insights into Ophiolitic Complexes in the …

Afghanistan and surrounding regions present a mosaic of continental blocks originating from Gondwanaland [42,44]. The Hercynian orogeny belt, characterized by …

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What Languages Are Spoken In Afghanistan?

The second official language of Afghanistan is Pashto, a member of the Indo-Iranian language family. This is an ancient language that shares some vocabulary with the Persian and Vedic Sanskrit languages. The language has been preserved through historical writings and poetry, although a high level of illiteracy among its speakers has led to an ...

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The Mesozoic of Afghanistan | GeoArabia | GeoScienceWorld

They are always altered, serpentinized, or epidotized. However, olivine basalts have been identified that differ from volcanic rocks (mainly andesites) in the Lower Cretaceous of the same region (see below, Triassic of the Kabul Block).

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The origin of Cenozoic continental basalts in east-central …

Continental flood and rift basalts commonly share the trace element distribution patterns with OIB, showing enrichment in LILE and LREE, depletion in HREE, and no depletion or even enrichment in HFSE in the primitive mantle-normalized spidergram (Farmer, 2014).Their Sr–Nd isotope compositions are also similar to each other, making the origin of OIB-like …

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Influences of the Stagnant Pacific Slab Beyond Its …

Pb–Nd–Hf isotope characteristics indicate that the carbonated eclogite-derived melts likely originated from the stagnant Pacific slab. Although Cenozoic basalts from both the east of the NSGL (ENSGL) and DVF domains exhibit light δ 26 Mg values, basalts from the ENSGL nevertheless have lower δ 26 Mg values than those in the DVF domain ...

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Numerical simulation of CO2 storage by basalts in …

Two pilot projects around the world have confirmed the feasibility of basalt to store CO 2.The first one is the CarbFix in-situ project in Iceland, where more than 95 % of the injected CO 2 were mineralized to form carbonate minerals within two years (Clark et al., 2020; Matter et al., 2016; Xing et al., 2022).The other is the Wallula basalt in-situ project in Washington State, …

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Petrogenesis of early Jurassic basalts in southern Jiangxi …

The basalts generally show a positive correlation between Zr and high field strength elements (HFSE, such as Ti and Nb), rare earth elements (REE) and Th, suggesting that these elements were immobile during alteration. In contrast, the lack of correlations between Zr and low field strength elements (LFSE: Cs, Rb, Ba) suggests the mobility of ...

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id/41/tambang afghanistan basalt.md at main · lqdid/id

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Origin of Permian OIB-like basalts in NW Thailand and …

The Carboniferous basalts are characterized by significant light REE enrichments coupled with slightly positive Nb-Ta ... Afghanistan to southern Tibet and then southward through SW China, NW ...

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Identifying deep recycled carbonates through Miocene basalts …

In comparison, there have been few cases on magmas of asthenospheric origin throughout the Plateau although a wealth of studies, especially seismic tomography, have pointed to the dynamic significance of asthenosphere in causing lithospheric mantle melting (e.g., Chung et al., 2005; Ding et al., 2003; Tian et al., 2017; Zhou and Lei, 2016).With the India-Asia …

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