Spinel + plagioclase symplectites in pelitic metamorphic rocks have been reported from many localities. We report detail an occurrence of this texture Tenmondai Rock, Lützow-Holm Complex, East Antarctica. This is produced by the following reaction; garnet sillimanite = spinel plagioclase. can be described as two net-transfer reactions; 5Grs Alm 12Als 3Hc 15An, and Prp 3Spl 15An. propose new geo...

Abstract Kimberlite-borne mantle eclogites represent an important diamond source rock. Although the origin and stability of diamond, as opposed to its low-pressure polymorph graphite, have been studied for decades, their relationship in rare natural samples where both polymorphs coexist remains poorly constrained. To shed new light on this issue, seven graphite–diamond-bearing from kimberlite p...

In Holsnøy (Bergen Arcs, Norway), metastable granulite facies anorthosite rocks are partially eclogitised within hydrous shear zones, that have been interpreted as widening over time with fluid influx and strain. We here present a detailed petrological description of two different metre-scale zones from this area. Within few tens centimetres each zone, the protolith (initially plagioclase + gar...

The main aim of this research is to define the mineralogical composition recent sediments deposited around Al-Teeb river basin in eastern Missan, trying determine provenance or source these sediments. study area represents southeastern edge Mesopotamian Plain and part it. Quaternary deposits cover most area. It clayey with old sea aeolian deposits. These 95% area, while older rocks, which date ...

Bai Hassan Formation is exposed as remnants of beds from previous formations due to severe erosion that were removed. Results grain size analysis revealed most the studied sediments coarse-grained ranging coarse sand gravel. The study shows are poorly sorted. values skewed coefficients ranged fine strongly skewed, and negative indicate occurrence hard changes in environment. Meanwhile, kurtosis...

Bangladesh’s heavy minerals deposits in river systems remain largely unexplored with past research restricted to beach placer along the south-eastern coastline of country. In this study, 64 samples were collected from stable sand bars northern Brahmaputra River. The average total (THM) all sample sites was 10.73 wt%, THM concentrations generally highest at outermost edges and lowest within mid-...