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| Content Provider | Springer Nature Link |
|---|---|
| Author | ACHARJEE, SANTANU RAY, JYOTISANKAR DEY, PAYEL BHATTACHARYYA, DEBAPRIYA BANERJEE, MOUSUMI CHATTOPADHYAY, BASAB SENGUPTA, SHYAMAL BHATT, A K DWIVEDI, A K MAHATO, SANJOY JANA, ARKA RANJAN MAITHANI, P B RAMESH BABU, P V |
| Copyright Year | 2016 |
| Abstract | The area of investigation at and around Mashak Pahar, Bankura district, West Bengal, India comprises a number of rock types namely: granite gneiss, migmatized quartz tourmaline gneiss, quartz pebble conglomerate, ferruginous quartzite, quartz tourmaline veins (as veins) and graphite schists. Interestingly, the study area lies in the region extending South Purulia Shear Zone (∼Tamar–Porapahar Shear Zone) which marks the boundary between two contrasting tectonic blocks of eastern India, namely, the Chhotanagpur Gneissic Terrane (CGC) to the north and Singhbhum Group of rocks to the south. The rocks of the study area are poly-phasedly deformed by three phases of folding, namely, F$_{1}$, F$_{2}$ and F$_{3}$. All the tourmalines are classified to be of ‘Alkali Group’. Chemistry of tourmalines from migmatized quartz tourmaline gneiss and those from quartz tourmaline veins are in conformity with their relation to (earthquake induced) shear system evolution in this terrain. In general, the compositional evolution of tourmaline during prograde metamorphism (∼400°–730°C) has been supported by both petrographic and chemical evidences. Assessment of mineral–chemical data of constituent tourmaline grains clearly suggests compositional variations across zonal boundaries within tourmaline that was controlled by changing metamorphic milieu in this terrane. Field and petrographic evidences clearly indicate activation of earlier and later shears in this region accompanied by infiltration of boron and formation of zoned tourmaline crystals. |
| Starting Page | 1681 |
| Ending Page | 1696 |
| Page Count | 16 |
| File Format | |
| ISSN | 02534126 |
| Journal | Journal of Earth System Science |
| Volume Number | 125 |
| Issue Number | 8 |
| e-ISSN | 0973774X |
| Language | English |
| Publisher | Springer India |
| Publisher Date | 2016-11-23 |
| Publisher Institution | Indian Academy of Sciences |
| Publisher Place | New Delhi |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | South Purulia Shear Zone tectonic block of eastern India shear zone poly-phased deformation; tourmaline chemistry boron infiltration. Earth Sciences Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) |
| Content Type | Text |
| Resource Type | Article |
| Subject | 1900/1901 |
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