Results 291 to 300 of about 696,092 (361)

Geochemical characteristics of heavy metals of bedrock, soil, and tea in a metamorphic rock area of Guizhou Province, China

Environmental science and pollution research international, 2022
Qihang Li, Chaofeng Li, Lanjun Liu, Wang Heng, Cheng Chen, J. Long, Xuefeng Wen   +6 more
semanticscholar   +1 more source

Garnet-biotite-clinozoisite gneiss: a new type of diamondiferous metamorphic rock from the Kokchetav Massif

, 2002
Clinozoisite gneisses were studied from the Barchi-Kol area, located 17 km to the west of the Kumdy-Kol microdiamond deposit at Kokchetav massif (Northern Kazakhstan).
A. Korsakov, V. Shatsky, N. Sobolev, Anton A. Zayachokovsky   +3 more
semanticscholar   +1 more source

Rheological properties of combustion metamorphic rock slurry for coalfield fire prevention

Bulletin of Engineering Geology and the Environment, 2021
Bobo Shi, Chen Chen, Peng Liu
semanticscholar   +1 more source

Metamorphic Rocks of Iran

2021
In this chapter, all metamorphic rocks of Iran have been studied and evaluated from the perspective of metamorphic facies, protoliths and their relationship with magmatic and orogenic phases. The distribution of metamorphic rocks is described along with the geological map and the grade of metamorphism.
openaire   +2 more sources

Igneous and metamorphic rock from Pleistocene gravels of central Louisiana

, 1939
Igneous and metamorphic rock types are found in gravels at the base of each of four distinct series of fluviatile deposits making up the four Pleistocene depositional terraces of Louisiana.
H. N. Fisk
semanticscholar   +1 more source

Hg in metamorphic rocks

Geochimica et Cosmochimica Acta, 1968
Abstract The concentration of Hg in the regionally metamorphosed politic schists, gabbroic rocks and in quartz, magnetite and hematite from metamorphosed iron formation rocks reported here ranged from tenths of ppb to tenths of ppm. The concentrations did not vary in a systematic way. However, in stepwise heating experiments the fraction of the total
G.W. Reed, G.W. Reed, S. Jovanovic, S. Jovanovic   +3 more
openaire   +2 more sources

Metamorphic rocks of the mantle

1990
In certain unusual geological environments rocks derived from the Earth’s mantle are found at the surface. They have come there in one of two ways, either by tectonic movements or by volcanic eruption. Many mantle rocks coming to the surface in either way can be recognized as metamorphic by their textures.
openaire   +2 more sources

The Laurentian rocks and metamorphism

Transactions of the Edinburgh Geological Society, 1885
In the early days of geology, as geologists are aware, granite and the associated highly metamorphic rocks were called ‶Primary Rocks,″ as from their position they were supposed to be the oldest rocks. This misnomer, in the early days of geology, was not an unnatural one, as these early observers supposed that strata accumulated by a process very ...
openaire   +2 more sources

Metamorphism of Quartzofeldspathic Rocks

2011
Metamorphosed quartzofeldspathic rocks are derived from graywacke sandstone and siltstone (clastic sediments; Table 2.3), and granitoid protoliths such as granite, alkali-feldspar granite, granodiorite and tonalite (Table 2.3). They constitute the largest portion of the continental crust.
Rodney Grapes, Kurt Bucher
openaire   +2 more sources

An experimental study on rock damage and its influence in rock stress memory in a metamorphic rock

Bulletin of Engineering Geology and the Environment, 2020
V. Srinivasan, T. Gupta, T. Ansari, T. Singh   +3 more
semanticscholar   +1 more source