Significance of the block rotation model in tectonics and mineralization in Precambrian terrains—An example from the South Indian shield

Chetty, T.R.K.

doi:10.1016/0264-3707(95)00012-x

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…Aydin et al . 1990; Ventura, 1994; Chetty, 1995; Aranguren et al . 1996; Marra, 2001; Adiyaman & Chorowicz, 2002; Breitkreuz & Mock, 2004; Sapiie & Cloos, 2004; Busby et al .…”

Section: Discussionmentioning

confidence: 99%

“…In this respect, it has been shown that in a block rotation scenario magmatic intrusions and hydrothermal fluid flow usually locate in transtension corners as a result of local lithostatic discharge (Christie-Blick & Biddle, 1985). These corners may be likely sites for decompression melting, and the faults and fractures could provide preferential conduits for magma and hydrothermal fluids (Chetty, 1995; Marra, 2001; Sapiie & Cloos, 2004; Tatar et al . 2004; Tibaldi et al .…”

Section: Discussionmentioning

confidence: 99%

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Albian syndepositional block rotation and its geological consequences, Basque–Cantabrian Basin (western Pyrenees)

Agirrezabala

Dinarès-Turell

2013

Geol. Mag.

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Stratigraphic, structural, palaeocurrent and palaeomagnetic analyses of Upper Albian deep-water deposits in and around the Deba block (Northern Iberia) are presented. Results indicate an anticlockwise vertical-axis rotation of this block by 35 • during a maximum time span of c. 1 Ma (Late Albian intra-C. auritus ammonite Subzone). This Albian syndepositional block rotation is interpreted to be the consequence of the coeval activity of conjugate major sinistral strike-slip faults and minor (antithetic) dextral strike-slip faults, which border the Deba block. On the base of conservative estimations, a minimum block-rotation rate of 35 • Ma −1 and a sinistral strike-slip rate of 1.2 km Ma −1 are calculated. As a consequence of the interaction of the rotated Deba block with adjacent nonrotated blocks, its corners experienced coeval transpressive (NW and SE corners) and transtensional deformations (SW and, possibly, NE corners). At the transtensional SW corner, two domal highreflective seismic structures have been recorded and interpreted as high-level magmatic laccoliths. These magmatic intrusions triggered the development of a mineralizing hydrothermal system, which vented to the Late Albian seafloor warm to hot hydrocarbon-rich fluids. Vented hydrocarbon was generated from Albian organic-rich sediments by contact alteration with hydrothermal fluids.

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“…Aydin et al . 1990; Ventura, 1994; Chetty, 1995; Aranguren et al . 1996; Marra, 2001; Adiyaman & Chorowicz, 2002; Breitkreuz & Mock, 2004; Sapiie & Cloos, 2004; Busby et al .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Albian syndepositional block rotation and its geological consequences, Basque–Cantabrian Basin (western Pyrenees)

Agirrezabala

Dinarès-Turell

2013

Geol. Mag.

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“…Structurally, the pipe occurs near the intersection of NNW-SSE trending major shear zones and ENE-WSW striking cross faults. The emplacement of the pipe has been attributed to block rotation tectonics (Chetty 1995), which explains the emplacement along a splay fault close to the intersection.…”

Section: Geological Settingmentioning

confidence: 99%

Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India

Parthasarathy

Chetty

Haggerty

2002

American Mineralogist

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While characterizing the mineralogy of the kimberlite at Venkatampalle, Andhra Pradesh, India (Lat. 14 56' 00" N, Long. 77 22' 15" E), we found the second occurrence of zemkorite (Na,K) 2 Ca(CO 3 ) 2 , which was first reported in 1989 in the Udachnaya kimberlite in Siberia. We also report the first Fourier-transform infrared spectroscopic (FTIR), scanning electron microscopic, thermo-gravimetric, and high-temperature heat capacity measurements on this rare carbonate. Powder X-ray diffraction (XRD) patterns show 24 well-resolved diffraction lines, all of which can be indexed with a hexagonal cell with a = 10.038(5) Å and c = 12.726(5) Å. The vibrational spectrum of zemkorite at room temperature exhibits 13 distinct absorption bands in the frequency range 2000 to 400 cm -1 . The IR bands of zemkorite indicate a structural similarity with shortite but are quite distinct from other alkali carbonates such as nyerereite, butschiite, and fairchildite. The heat capacity of zemkorite has been measured up to 700 K by differential scanning calorimetric techniques. The temperature dependence of the heat capacity of zemkorite was fitted with the polynomial C P = 140.2 + 8.584 ¥ 10 -2 T -2.458 ¥ 10 6 T -2 . The upper thermal stability of zemkorite is ~700 K, which is similar to shortite. Zemkorite may have formed during the late stages of kimberlite genesis, possibly as a result of metasomatism or by the breakdown of metasomatic natrocarbonatitic minerals or glass that segregated on decompression melting in the upper mantle.

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Extracting Structural Information from a Satellite Image in a Cratonic Region: A Structural Geologist’s Perspective

Chetty

2020

Journal of the Geological Society of India

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Significance of the block rotation model in tectonics and mineralization in Precambrian terrains—An example from the South Indian shield

Cited by 4 publications

References 21 publications

Albian syndepositional block rotation and its geological consequences, Basque–Cantabrian Basin (western Pyrenees)

Albian syndepositional block rotation and its geological consequences, Basque–Cantabrian Basin (western Pyrenees)

Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India

Extracting Structural Information from a Satellite Image in a Cratonic Region: A Structural Geologist’s Perspective

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