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Title: Petrological and structural study of the precambrian rocks of Botlaguduru area Kanigiri taluk Prakasam district Andhra Pradesh
Researcher: Sarma, K P
Guide(s): Rao, M N
Keywords: Amphibolites
University: Gauhati University
Completed Date: 31/07/1978
Abstract: The Precambrian metamorphites occurring around Botlaguduru, Kanigiri taluk, Prakasam district, Andhra Pradesh, Southern India, are the subject of the present investigation. The area forms a part of the Nellore schist belt, the latter lying between the Cuddapah basin on the west and the Eastern Ghats belt on the east. An area of 207 sq. km has been lithologically and structurally mapped on a scale of 1:31680 while a part of it (the central sector) has been structurally mapped in more detail on a scale of 1:15840. The metamorphites are represented by metasediments (including metapelites, quartzites, banded ferruginous quartzites, calc-silicate rocks and quartz-hornblende-biotite schists), numerous concordant bands of amphi-bolites, quartzo-feldspathic gneisses, quartz-anthophyllite rock, meta-basic rocks and different vein rocks most of which were affected by multiple deformation and polymetamorphism. The study of the structural elements reveal a complex tectonic history involving five phases of deformation of which the imprint of three phases (D1, D2 and D5) is seen only on the mesoscopic scale while that of the other two (D3 and D4) is seen in the form of large macroscopic folds. The regional foliation (S1)-axial planar to F1-is a dominant, pervasive planar element in the area while the development of other folia-tions, S2 and S3, was confined to narrow shear zones of the later folds (F3 and F4). Of the three regional folds established in the area, two (the Ayyavaripalle antiform in the eastern sector and the Kodigumpala-Mopadu composite synform in the central sector) belong to the third deformational event while the macroscopic fold in the western sector (the Vaggampalle overturned antiform) belong to the fourth phase of deformation. The former two were affected by F4 resulting in mild curva-tures to highly sinuous nature of the regional F3 folds, the intensity of D4 thus increasing from SE towards NW, reaching its climax in the formation of the Vaggampalle overturned antiform (F4). Laboratory investigations...
Appears in Departments:Department of Geological Science

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02_certificate.pdf15.86 kBAdobe PDFView/Open
03_content.pdf233.94 kBAdobe PDFView/Open
04_list of plates.pdf213.67 kBAdobe PDFView/Open
05_list of figures.pdf135.34 kBAdobe PDFView/Open
06_list of maps.pdf9.06 kBAdobe PDFView/Open
07_acknowledgement.pdf28.7 kBAdobe PDFView/Open
08_abstract.pdf82.77 kBAdobe PDFView/Open
09_chapter 1.pdf170.83 kBAdobe PDFView/Open
10_chapter 2.pdf2.02 MBAdobe PDFView/Open
11_chapter 3.pdf12.23 MBAdobe PDFView/Open
12_chapter 4.pdf8.15 MBAdobe PDFView/Open
13_chapter 5.pdf702.75 kBAdobe PDFView/Open
14_chapter 6.pdf473.69 kBAdobe PDFView/Open
15_chapter 7.pdf829.03 kBAdobe PDFView/Open
16_chapter 8.pdf4.86 MBAdobe PDFView/Open
17_chapter 9.pdf465.63 kBAdobe PDFView/Open
18_chapter 10.pdf38.67 kBAdobe PDFView/Open
19_summary and conclusion.pdf308.57 kBAdobe PDFView/Open
20_references.pdf606.22 kBAdobe PDFView/Open

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