The 1928?1929 eruption of Kammourta volcano ? evidence of tectono-magmatic activity in the Manda-Inakir rift and comparison with the Asal Rift, Afar depression, Republic of Djibuti
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Rift valley
Cinder cone
Mineral resource classification
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The relations of Yellowstone Tertiary volcanics to Tertiary faults in the Teton Range indicate that major movements probably occurred in early Pliocene time, following deposition of Miocene basic volcanics and associated sediments and prior to outpourings of plateau rhyolite, and that minor movements continued into Recent time. Erosion surfaces representing the late-mature stage Black Rock cycle are covered by the rhyolite. This relationship and the youthful geomorphic aspect of the rhyolite plateau indicate that the rhyolite and younger valley basalt are probably of early, or early middle, Pleistocene age. More precise dating of the rhyolite depends upon the age assigned to the Buffalo drift, which rests on these volcanics.
Volcanic plateau
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Baijiangou is in the Kelameili mountain of eastern Junggar Basin.The Carboniferous volcanic rocks in the Baijiangou is various,such as basalt,andesibasalt,andesite,rhyolite and volcanic brecci.The Carboniferous volcanic rocks of west Baijiangou stand for the rock sequence of lower Bashan group(C2b),while the the Carboniferous volcanic rocks of east Baijiangou stand for the rock sequence of upper Bashan group(C2b).The whole sequence of Baijiangou outcroup includes basalt andesite rhyolite.This sequence of vocanic rocks is in accord with the magma evolution law and the well logging,and could be as a guide for the exploration of Carboniferous volcanic rocks.
Outcrop
Basaltic andesite
Sequence (biology)
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Isotope Geochemistry
Trachyte
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By the analysis of discontinuity at the outcrop and lineament on the satellite image, the joints have deeply relationship with the lineaments. The joint spaces at the drilling core are mostly 1~20 cm but at the rhyolite which is distributed near fault they have more closely. These volcanic rocks belong to the subalkaline series tuff, rhyolite, basalt in the study area from the diagram of . The composition diagram of Hf/3-Th-Nb/16 show destructive plate-margin basalt and their differentiates. The environment of formation of volcanics are normal continental arc. Most of LREE show high enriched pattern but HREE show depleted pattern. The K/Ar age of intermediate volcanics, tuff, rhyolite, crystal tuff are 55.3Ma, 77.25 Ma~91.22Ma, 63.16~64.39Ma, 54.49 Ma respectively.
Outcrop
Lineament
Breccia
Discontinuity (linguistics)
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The relations of Yellowstone Tertiary volcanics to Tertiary faults in the Teton Range indicate that major movements probably occurred in early Pliocene time, following deposition of Miocene basic volcanics and associated sediments and prior to outpourings of plateau rhyolite, and that minor movements continued into Recent time. Erosion surfaces representing the late-mature stage Black Rock cycle are covered by the rhyolite. This relationship and the youthful geomorphic aspect of the rhyolite plateau indicate that the rhyolite and younger valley basalt are probably of early, or early middle, Pleistocene age. More precise dating of the rhyolite depends upon the age assigned to the Buffalo drift, which rests on these volcanics.
Deposition
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