Basalts that fractionated plagioclase, ... Afghanistan moved in pair with Iran after 290 Ma 12,16,19,66, Sibumasu moved in pair with Qiantang after 289 Ma 67,70,71,72.Web

Geochemical data (major and minor oxides, trace elements including REE, and Sr, Nd, Pb, and O isotopes) have been obtained on a number of flow sequences and plutonic and volcanic complexes of the DVP by numerous groups since the early 1970's. Evaluation of these data has led to the classification of the basalts and other rock types, …Web

Babrak Karmal is installed as Afghanistan's Soviet-backed ruler. Groups of guerrilla fighters known as mujahideen or holy warriors mount opposition and a jihad …Web

Depleted and enriched basalts in the Hellefisk well show contemporaneous melting of depleted and enriched mantle components in the asthenosphere. The Hekja and Davis Strait High basalts and picrites have unique, ultradepleted compositions with (La/Sm) N < 0.5, (Tb/Lu) N < 1 and Nb/Zr = 0.013–0.027. We interpret these compositions as a product ...Web

Support Afghanistan institutions and personnel in the soil departments to produce and maintain updated soil information; Show the location and type of soil and …Web

The Helmand Basin shows a long tectonic history, which is located inside the Afghan Block formed from the collision of several microplates (Siehl 2017 ). In …Web

Basalt is also an abundant rock on the Moon. Much of the Moon's surface is underlain by basaltic lava flows and flood basalts. These areas of the Moon are known as "lunar maria." Large areas of the Moon have been …Web

PGB samples show a comparable SiO 2 range (48.5-53 wt%) as Steens and Imnaha Basalts (with <51% SiO 2 for Rock Creek and >51% for American Bar chemical types of Imnaha Basalt; cf. Hooper, 1984 ...Web

Large olistoliths of intra-plate alkali basalts of hotspot affinity (Sawada et al. 1993; Siddiqui et al. 1994) are found within the hyaloclastite in the Muslim Bagh area ... Boulin J (1981) Structure d Afghanistan sutures periindiennes et Tethys orientale. CR Academy of Sci Paris Ser D 292:239–242. Google Scholar Boulin J (1988) Hercynian and ...Web

The basalts have variable 87Sr/86Sr (0.704177–0.705139) and 143Nd/144Nd (0.512689–0.512830) ratios, within the range of OIB-like intra-plate alkaline basalts erupted in eastern Iran north of ...Web

Here we provide field, petrographic and geochemical data on large tholeiitic lava flows (sheet lobes) and associated dykes of the Saurashtra region in the …Web

The Soviet army in Kabul, Afghanistan, on Dec. 31, 1979. Francois Lochon/Gamma-Rapho/Getty Images. The collapse of the Afghan government and the Taliban's recapture of power came after a blitz by ...Web

Afghanistan, a mountainous territory nestled in the heartland of Asia, has long been a battlefield of global powers. But it has never been conquered, and hence …Web

The flows are fractionated low-K tholeiitic basalts, basalticandesites, and andesites. Relative enrichment in their LILE and depletion in HFSE, and negative Nb and Ta and positive K, Ba and Sr anomalies point to a subduction-related origin. Compared to MORB, the least fractionated Chagai basalts have low Na 2 O, Fe 2 O 3 T, CaO, Ti, Zr, …Web

Mg# values in basalts (from either the volcanic sequence or sheeted dyke, or individual dykes) range from 70.5 to 49.5 (average is 58) suggesting that most of these basalts likely represent melts at a low to moderate degrees of magmatic fractionation, whereas relatively primitive basalts are subordinate.Web

A powerful earthquake has killed at least 1,000 people and injured 1,500 in eastern Afghanistan, an official of the ruling Taliban told the BBC. The Taliban appealed for international help for the ...Web

A plagioclase-accumulation model is used to account for the high alumina contents. Moreover, the basalts have enriched MORB (E-MORB) -like trace element characteristics with lower ε Nd (t) values (6.4–8.0) and (87 Sr/ 86 Sr) i ratios (0.7032–0.7036). Their incompatible element ratios exhibit linear correlation with the …Web

Afghanistan War, international conflict in Afghanistan beginning in 2001 that was triggered by the September 11 attacks and consisted of three phases. The first phase—toppling the Taliban (the …Web

A post-rift Aptian magmatism is recorded in a 500-m-thick sequence of basalts interbedded with marls in the Bacalhau oil and gas field in Santos Basin, SE Brazil. This magmatic section is within the so-called pre-salt sequence of Santos Basin that comprises the major oil and gas reserves of Brazil. This is the first publication of …Web

In Flood Basalts of Asia (eds Sheth, HC and Vanderkluysen, L), pp. 146 –66. Journal of Asian Earth Sciences 84.Google Scholar. Duraiswami, RA, Sheth, H, Gadpallu, P, Youbi, N and Chellai, H (2020) A simple recipe for red bole formation in continental flood basalt provinces: weathering of flow-top and flow-bottom breccias.Web

In general, vesicular basalts in acquisition and core of three-dimensional CT data, using different materials to ray absorption attenuation coefficient of inconsistency, ... sedimentary phase and tectonic stress analysis of the Meso-Cenozoic sedimentary strata of the Tajik Basin and the Afghan Massif on the western side of the Pamir, and found ...Web

New geochemical and geochronological data lead to a fuller understanding of different aspects of the Rajmahal flood basalt province. Earlier work was on surface Rajmahal flows as well as from the nearby Bengal Traps. Samples from a ~300 m borehole near the northwestern corner of the Rajmahal lavas, analyzed herein, reveal the …Web

The Madagascar Cretaceous igneous province exposed in the Mahajanga basin is represented by basalt and basaltic andesite lavas. New 40 Ar– 39 Ar plateau ages (92.3 ± 2.0 Ma and 91.5 ± 1.3 Ma) indicate that the magmatism in the Mahajanga basin started about 92 Ma ago. Four geochemically distinct magma types (Groups A–D) are …Web

These mafic rocks comprise pillow basalts characterized by a vesicular structure. The mid-ocean ridge basalt (MORB)-normalized trace element patterns of basalts from the study area display ...Web

A geochemical study was undertaken on basaltic lava flows intercalated with Oligocene to Miocene strata in the Sabzevar region, northern Iran, to examine their petrogenesis in a regional tectonic framework. The lavas are either aphyric or have phenocrysts and micro-phenocrysts of olivine and, to a lesser extent, clinopyroxene. …Web

Basalts are usually dark colored, i.e., dark gray, brown-black, greenish-black, or black fine-grained rocks. However, they can have other textures and colors. Also, weathered hand specimens may have a tan, yellow, brown, or reddish-brown surface. Thus, try to get one with a freshly cut surface. 1. ColorsWeb

Anorthite megacrysts are common in basalts from the Japanese Island Arc, and signally rare in other global fields. These anorthites are 1 to 3 cm in size and often contain several corroded Mg-olivine inclusions. The megacrysts generally range from An 94 Ab 4 Ot 2 to An 89 Ab 6 Ot 5 (Ot: other minor end-members, including CaFeSi 3 O 8, …Web

The coastal region of southwest Saudi Arabia contains a thick sequence of Late Oligocene basalts in the Jizan Group, which accumulated along the continental rift that preceded the opening of the Red Sea. These basalts are targeted for the disposal of CO2 emitted from industrial sources by subsurface carbon mineralization processes. The …Web

Basalt rock is made from volcanos, as it forms from lava that rapidly cools above the surface. Basalt is a type of extrusive igneous rock that gets its dark color from the composition of its ...Web

The Cenozoic intraplate volcanism in northeast China is located more than 1,000 km westward of the Japan Trench 1, while the young alkaline basalts (0–6 Ma) known as petit-spots outcrop up to ...Web

Comparison with the different types of OIB indicates that the basalts may be derived from a high U/Pb (HIMU) source with slightly elevated K and Ba contents. The basalts show general trends of increasing incompatible elements (K 2 O, Nb, Y, Sr and Yb), and decreasing contents of compatible elements (Cr, Ni, Sc and Ca) with decreasing Mg no.Web

LREE-enriched komatiitic basalts are commonly found in association with LREE-depleted komatiites. This association is found in a sequence of late Archaean lavas from Newton Township, Ontario. The komatiitic lavas at Newton Township differ from most late Archaean examples in that both the komatiites and the komatiitic basalts are …Web

River basalts of the northwestern United States. Basalts also occur abundantly on the moon and on the inner planets, including Mars. Basalts are dis- cussed in all textbooks on igneous rocks (e.g., Williams et al., 1982; Philpotts, 1990). Basalts can be classified into two broad types- tholeiite and alkali-based on their chemical char-Web

Gem minerals at Lava Plains, northeast Queensland, offer further insights into mantle-crustal gemformation under young basalt fields. Combined mineralogy, U-Pb age determination, oxygen isotope and petrological data on megacrysts and meta-aluminosilicate xenoliths establish a geochemical evolution in sapphire, zircon formation between 5 to 2 Ma.Web

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 …Web

Was there Jurassic paleo-Pacific subduction in South China?: Constraints from 40Ar/39Ar dating, elemental and Sr–Nd–Pb isotopic geochemistry of the Mesozoic basalts. Lithos, Vol. 106, Issue. 1-2, p. 83.Web

In the plot of Th/Yb versus Ta/Yb for discriminating tectonic setting of basaltic rocks 77, all samples plot in the array of basalts from non-subduction settings (e.g., MORB, and within plate ...Web