Paleoproterozoic Cordilleran-style accretion along the south eastern margin of the eastern Dharwar craton: Evidence from the Vinjamuru arc terrane of the Krishna orogen, India

Lithos ◽  
2016 ◽  
Vol 263 ◽  
pp. 122-142 ◽  
Author(s):  
Chiranjeeb Chatterjee ◽  
Ravikant Vadlamani ◽  
Om Prakash Kaptan
Keyword(s):  
Dharwar Craton ◽  
Eastern Dharwar Craton ◽  
The South ◽  
Eastern Margin ◽  
South Eastern

The Požarevac loess–paleosol sequence: a record of increased aridity in the south‐eastern margin of the Carpathian Basin during the last 350 ka

2021 ◽  
Author(s):  
Slobodan B. Marković ◽  
Eric A. Oches ◽  
Zoran M. Perić ◽  
Tivadar Gaudenyi ◽  
Mlađen Jovanović ◽  
...  
Keyword(s):  
Carpathian Basin ◽  
The South ◽  
Eastern Margin ◽  
South Eastern

The composition and paragenesis of the hornblendes of the Glen Tilt complex, Perthshire

1938 ◽  
Vol 25 (161) ◽  
pp. 56-74 ◽  
Author(s):  
W. A. Deer
Keyword(s):  
Chemical Investigation ◽  
Optical Investigation ◽  
The South ◽  
Eastern Margin ◽  
South Eastern ◽  
Single Complex

The south-eastern margin of the Glen Tilt complex consists of a long strip of diorites with a number of small associated patches of rocks of appinitic type. Xenoliths, both of hornblendite and hornblendeschist, the latter belonging to the Perthshire series of the Dalradian, are found enclosed within the dioritic rocks, which range petrographically from diorite to quartz-mica-diorite. In all these rocks hornblende is the most important fcrromagnesian constituent always predominating over pyroxene in the basic members and frequently persisting to the exclusion of biotite in the intermediate rocks of the intrusion. The hornblendes were examined chemically because of the difficulty of estimating their composition even from a thorough optical investigation. As they play such an important role in the complex it is considered that they may give some indication of the history and mode of formation of the rocks in which they occur. Such a chemical investigation of a series of related hornblendes will also indicate the possible range of composition of common amphiboles within the diorites and related rocks of a single complex.

Proposed chronostratigraphic units for the Carboniferous and Early Permian of the southwestern Gondwana margin

2020 ◽  
pp. SP512-2020-48
Author(s):  
Carlos R. González ◽  
Pamela Díaz Saravia
Keyword(s):  
Ice Age ◽  
South American ◽  
Early Permian ◽  
The South ◽  
Eastern Margin ◽  
South Eastern ◽  
Gondwana Margin ◽  
Central Western Argentina ◽  
Southwestern Margin ◽  
Regional Reference

AbstractThe western Andean belt of Argentina displays a comprehensive record of the Carboniferous and earliest Permian rocks so extensive that it allows an exceptional reconstruction of the Late Palaeozoic Ice Age of the southwestern margin of the South American Gondwana area. Severe endemism of the Gondwana biota during this period makes it difficult to achieve a precise correlation of these glacially influenced deposits with the coeval sequences of the Palaeoequatorial belt, where the subdivisions of the International Chronostratigraphic Chart are currently defined. The abundant paleontological record available from the Upper Palaeozoic deposits of central-western Argentina, central Patagonia, and eastern Argentina, makes it possible to recognize five successive faunal stages that allow a proper ordering of the sequences of this period. The proposed regional stages, and their assumed chronologic position regarding the standards of the current International Chronostratigraphic Chart, are: the Malimanian (late Tournaisian), Barrealian (Mid-Carboniferous or Serpukhovian-Bashkirian), Aguanegrian (Upper Pennsylvanian), Uspallatian (Asselian-Tastubian?) and Bonetian (Sakmarian). This paper aims to reiterate former recommendations about the convenience of having regional reference units and suggests the consideration of the available faunal stages as possible chronostratigraphic subdivisions for the Carboniferous-early Permian of the south-eastern margin of Gondwana.

Mesoproterozoic island arc magmatism along the south-eastern margin of the Indian Plate: Evidence from geochemistry and zircon U-Pb ages of mafic plutonic complexes

2016 ◽  
Vol 130 ◽  
pp. 116-138 ◽  
Author(s):  
K.S.V. Subramanyam ◽  
M. Santosh ◽  
Qiong-Yan Yang ◽  
Ze-ming Zhang ◽  
V. Balaram ◽  
...  
Keyword(s):  
Island Arc ◽  
Indian Plate ◽  
Arc Magmatism ◽  
The South ◽  
Eastern Margin ◽  
South Eastern

XXIX.—Petrography of Igneous Rocks from the Vatnajökull Region, Iceland, collected by Mr F. W. Anderson

1949 ◽  
Vol 61 (3) ◽  
pp. 793-801 ◽  
Author(s):  
G. W. Tyrrell
Keyword(s):  
Ice Sheet ◽  
Igneous Rocks ◽  
The South ◽  
Northern Margin ◽  
Eastern Margin ◽  
South Eastern ◽  
Active Volcanoes

In the following paper ninety-eight rocks collected by Mr F. W. Anderson from the Tertiary lavas and intrusions on the south-eastern margin of the Vatnajökull, and from the Pleistocene and Recent lavas, tuffs and sediments of Kverkfjöll Eystri on the northern margin of the ice-sheet, are described. Interest in the geology of the Vatnajökull region has been revived by several recent expeditions.The existence of active volcanoes under the Vatnajökull, and the eruptions that occasionally break through the ice-sheet, offer unexampled opportunities for the investigation of the peculiar igneous and sedimentary products which are the results of the contest between ice and volcanism, and for the solution of the “Palagonite Problem”, with which several authors have recently dealt.

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