All the known lode gold prospects and deposits in Chitradurga schist belt (CSB) are spatially associated with two transcrustal shear zones, Chitradurga Eastern Shear Zone (CESZ) and Chitradurga Central Shear Zone (CCSZ), though they have varied geological setting with regards to lithology and host structure. Along its entire stretch, the CCSZ is characterized by a wide zone of intense carbonatisation, however no such regionally extensive carbonatisation is associated with CESZ. Auriferous quartz carbonate lodes are localized along zones of dialatation like second order structures and/or contacts of litho units of contrasting competency. Overpinting of the structural fabric of second deformational phase (D2) on the quartz lodes in prospects associated with CCSZ clearly constrain the event as D1. However, lodes localized along second order structure related to CESZ ought to be syn-to late D2 which is the event of CESZ development. In the lower sequence of Dharwar Supergroup, gold mineralisation in quartzite of Bababudan Group is recorded in Halekallu outlier; BIF hosted gold mineralization in Kalinganahalli, Yediyur-Karigatta belt, and vein type mineralization associated with mafic-ultramafic sequence in Kenchanahalli and Honnabetta prospects, Nagamangala belt, which constitutes the southern continuation of CSB. The lone occurrence of gold related to Vanivilas Formation where mineralization is hosted in Fe-Mn phyllite is recorded near Bodimardi in the northern closure area of the Sirankatte dome. The varied nature of gold mineralization in terms of host rock characteristics and structural controls and its continuum over time from the base of Dharwar Supergroup sedimentation, volcanism, deformation and metamorphism indicates recycling and localization of gold from the volcano-sedimentary sequence over a protracted period of time.
Regional and Deposit Scale Controls of Gold Mineralization in Chitradurga Schist Belt, Dharwar Craton, India
₹100.00
All the known lode gold prospects and deposits in Chitradurga schist belt (CSB) are spatially associated with two transcrustal shear zones, Chitradurga Eastern Shear Zone (CESZ) and Chitradurga Central Shear Zone (CCSZ), though they have varied geological setting with regards to lithology and host structure. Along its entire stretch, the CCSZ is characterized by a wide zone of intense carbonatisation, however no such regionally extensive carbonatisation is associated with CESZ. Auriferous quartz carbonate lodes are localized along zones of dialatation like second order structures and/or contacts of litho units of contrasting competency. Overpinting of the structural fabric of second deformational phase (D2) on the quartz lodes in prospects associated with CCSZ clearly constrain the event as D1. However, lodes localized along second order structure related to CESZ ought to be syn-to late D2 which is the event of CESZ development. In the lower sequence of Dharwar Supergroup, gold mineralisation in quartzite of Bababudan Group is recorded in Halekallu outlier; BIF hosted gold mineralization in Kalinganahalli, Yediyur-Karigatta belt, and vein type mineralization associated with mafic-ultramafic sequence in Kenchanahalli and Honnabetta prospects, Nagamangala belt, which constitutes the southern continuation of CSB. The lone occurrence of gold related to Vanivilas Formation where mineralization is hosted in Fe-Mn phyllite is recorded near Bodimardi in the northern closure area of the Sirankatte dome. The varied nature of gold mineralization in terms of host rock characteristics and structural controls and its continuum over time from the base of Dharwar Supergroup sedimentation, volcanism, deformation and metamorphism indicates recycling and localization of gold from the volcano-sedimentary sequence over a protracted period of time.
Publication Mode |
Online |
---|---|
Publication Author |
J. P. Mohakul, P. H. Babu, R. Madusudanan, S. A. Khan, S. Balakrishnan |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2021 |
You must be logged in to post a review.
Reviews
There are no reviews yet.