Anatomy of a Forearc Submarine Fan: Upper Eocene — Oligocene Andaman Flysch Group, Andaman Islands, India

2001 ◽  
Vol 4 (3) ◽  
pp. 477-486 ◽  
Author(s):  
Partha Pratim Chakraborty ◽  
Tapan Pal
2002 ◽  
Vol 21 (2) ◽  
pp. 189-196 ◽  
Author(s):  
Partha Pratim Chakraborty ◽  
Basab Mukhopadhyay ◽  
Tapan Pal ◽  
Tanay Dutta Gupta

1984 ◽  
Vol 121 (4) ◽  
pp. 311-318 ◽  
Author(s):  
Bimal K. Samanta

AbstractBiplanispira Umbgrove is closely related to Pellatispira Boussac, from which it probably arose by the subdivision of the median chambers by the rapidly expanding marginal crest and the development of planispirally arranged secondary chambers on both sides of the peripheral flange. The genus appears to be polyphyletic, its species having been derived from different representatives of Pellatispira. Illustrated records of Biplanispira are confined to the region between eastern India and Eua, Tonga, and the genus appears to be restricted to the middle and upper parts of the Upper Eocene. In the Upper Eocene of the Garo Hills, eastern India, it is represented by B. hoffmeisteri (Whipple) and in the Andaman Islands by B. mirabilis (Umbgrove). This is the first record of the genus from mainland India.


10.1144/m47.9 ◽  
2017 ◽  
Vol 47 (1) ◽  
pp. 133-140 ◽  
Author(s):  
P. C. Bandopadhyay ◽  
A. Carter
Keyword(s):  

2003 ◽  
Vol 140 (3) ◽  
pp. 289-307 ◽  
Author(s):  
TAPAN PAL ◽  
PARTHA PRATIM CHAKRABORTY ◽  
TANAY DUTTA GUPTA ◽  
CHANAM DEBOJIT SINGH

The Andaman Islands, the central part of Burma–Java subduction complex, expose tectonostratigraphic units of an accretionary prism in an outer-arc setting and turbidites of a forearc setting. A number of N–S-trending dismembered ophiolite slices of Cretaceous age, occurring at different structural levels with Eocene trench-slope sediments, were uplifted and emplaced by a series of E–dipping thrusts. Subsequently, N–S normal and E–W strike-slip faults resulted in the development of a forearc basin with deposition of Oligocene and Mio-Pliocene sediments. Metapelites and metabasics of greenschist to amphibolite grade occur in a melange zone of ophiolites. The Eocene Mithakhari Group represents pelagic trench sediments and coarser clastics derived from ophiolites. Evidence of frequent facies changes, predominance of mass flow deposits, syn-sedimentary basinal disturbance and wide palaeogeographic variation indicate deposition of Eocene sediments in isolated basins of an immature trench-slope setting. Deposition of the Oligocene Andaman Flysch Group in a forearc setting is indicated by the large-scale persistence of beds, lack of small-scale lithological variation, bimodal provenance, less deformation, a well-defined submarine fan sequence and development predominantly on the eastern part of the outer arc. The Mio-Pliocene Archipelago Group includes alternations of siliciclastic turbidites and subaqueous pyroclastic flow deposits in the lower part and carbonate turbidites in the upper part, suggesting its deposition in the shallower forearc compared to the siliciclastic Oligocene sediments.


2020 ◽  
Vol 11 (3) ◽  
pp. 3384-3390
Author(s):  
Ashish ◽  
Anjali ◽  
Dixit Praveen K ◽  
Nagarajan K ◽  
Sahoo Jagannath

Justicia gendarussa Burm .f. (family Acanthaceae) which is also known as willow-leaves and commonly known as Nili-Nirgundi, it is very commonly found nearby to China and its availability is very common in larger parts of India and Andaman islands. Traditionally it is used to treat various sorts of disorders such as wound healing, anti-inflammatory, anti-oxidant, antiproliferative, anti-arthritic etc. Justicia gendarussa is one of the crucial herbs which has been used in the Ayurveda. Majorly leaves parts of the plant shows the pharmacological activity but the root of the plant Justicia gendarussa is also have the important medicinal values. A large variety of pharmacologically active constituents i.e., alkaloids, flavonoids, saponin, carbohydrates, steroids, triterpenoids, carotenoids, aminoacids, tannins, phenolics, coumarines and anthaquinones are also present in this plant and they makes the plant pharmacologically important. The activity of the plant is also dependent on the solvent which is used for the extraction the various vital chemical constituents. The different- different parts of the plants having the different medicinal values also differ in the chemical values. This review is not only focused on the essential phytochemical constituents which is available in the plant but it also explains their necessary medicinal value to shows the essential biological action and phytopharmacological actions of various parts of the plant.


Sign in / Sign up

Export Citation Format

Share Document