High radiogenic heat production in the Kerala Khondalite Block, Southern Granulite Province, India.
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| Title: | High radiogenic heat production in the Kerala Khondalite Block, Southern Granulite Province, India. |
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| Authors: | Ray, Labani1 (AUTHOR) labani_ngri@rediffmail.com, Roy, Sukanta1 (AUTHOR) sukantaroy@yahoo.com, Srinivasan, R.1,2 (AUTHOR) srinivasanmalathi@rediffmail.com |
| Source: | International Journal of Earth Sciences. Apr2008, Vol. 97 Issue 2, p257-267. 11p. |
| Abstract: | In situ radioelemental (K, U and Th) analysis and heat production estimates have been made at 59 sites in the Kerala Khondalite Block (KKB) of the Southern Granulite Province (SGP) of India. Together with the in situ analyses on granulites and gneisses previously reported from 28 sites, and heat production estimated from the published geochemical analyses on granites and syenites of the KKB, the new data set allows good characterization of heat production for the major granulite facies rocks and granitoids of the KKB. Garnet biotite gneisses are characterized by high levels of Th and U, with mean values of 60 and 3 ppm, respectively. Khondalites, leptynites and charnockites have slightly lower levels of Th (23, 20 and 22 ppm, respectively) and U (2.9, 2.4 and 0.9 ppm, respectively). The mean K, U, Th abundances for the granites, leucogranites and granitic gneisses ranges from 3.9 to 4.3%, 2.6 to 4.3 ppm, 22 to 50 ppm respectively, and for the syenites 4.8%, 2 ppm and 5.7 ppm. Mean radiogenic heat production values for garnet–biotite gneiss, khondalite, leptynite and charnockite are 5.5, 2.7, 2.4 and 2.2 μm-3, respectively. For the granites, leucogranites, granitic gneisses and syenites it is 2.6, 3.4, 4.6 and 1.4 μm-3, respectively. Heat production of granulite facies rocks, which are the most abundant rocks in KKB, correlate well with Th, but less with U, suggesting that variation is caused by Th and U bearing accessory minerals such as monazite and zircon. The high heat production of the KKB granulites are in contrast to the low heat production of the Late Archaean granulites of the Northern Block (NB) of the SGP which are highly depleted in radioelements and also the granulites of Madurai Block (MB) that have higher radioelemental abundances than in the granulites of the NB. The high heat production of the KKB granulites could be due to the nature of protoliths and/or metasomatism associated with Neoproteroic- to- Pan African alkaline magmatic activity represented by alkali granite and syenite–carbonatite emplacements and emplacement of pegmatites. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 194734743 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: High radiogenic heat production in the Kerala Khondalite Block, Southern Granulite Province, India. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ray%2C+Labani%22">Ray, Labani</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> labani_ngri@rediffmail.com</i><br /><searchLink fieldCode="AR" term="%22Roy%2C+Sukanta%22">Roy, Sukanta</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sukantaroy@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Srinivasan%2C+R%2E%22">Srinivasan, R.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> srinivasanmalathi@rediffmail.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Earth+Sciences%22">International Journal of Earth Sciences</searchLink>. Apr2008, Vol. 97 Issue 2, p257-267. 11p. – Name: Abstract Label: Abstract Group: Ab Data: In situ radioelemental (K, U and Th) analysis and heat production estimates have been made at 59 sites in the Kerala Khondalite Block (KKB) of the Southern Granulite Province (SGP) of India. Together with the in situ analyses on granulites and gneisses previously reported from 28 sites, and heat production estimated from the published geochemical analyses on granites and syenites of the KKB, the new data set allows good characterization of heat production for the major granulite facies rocks and granitoids of the KKB. Garnet biotite gneisses are characterized by high levels of Th and U, with mean values of 60 and 3 ppm, respectively. Khondalites, leptynites and charnockites have slightly lower levels of Th (23, 20 and 22 ppm, respectively) and U (2.9, 2.4 and 0.9 ppm, respectively). The mean K, U, Th abundances for the granites, leucogranites and granitic gneisses ranges from 3.9 to 4.3%, 2.6 to 4.3 ppm, 22 to 50 ppm respectively, and for the syenites 4.8%, 2 ppm and 5.7 ppm. Mean radiogenic heat production values for garnet–biotite gneiss, khondalite, leptynite and charnockite are 5.5, 2.7, 2.4 and 2.2 μm-3, respectively. For the granites, leucogranites, granitic gneisses and syenites it is 2.6, 3.4, 4.6 and 1.4 μm-3, respectively. Heat production of granulite facies rocks, which are the most abundant rocks in KKB, correlate well with Th, but less with U, suggesting that variation is caused by Th and U bearing accessory minerals such as monazite and zircon. The high heat production of the KKB granulites are in contrast to the low heat production of the Late Archaean granulites of the Northern Block (NB) of the SGP which are highly depleted in radioelements and also the granulites of Madurai Block (MB) that have higher radioelemental abundances than in the granulites of the NB. The high heat production of the KKB granulites could be due to the nature of protoliths and/or metasomatism associated with Neoproteroic- to- Pan African alkaline magmatic activity represented by alkali granite and syenite–carbonatite emplacements and emplacement of pegmatites. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00531-007-0278-8 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 257 Titles: – TitleFull: High radiogenic heat production in the Kerala Khondalite Block, Southern Granulite Province, India. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ray, Labani – PersonEntity: Name: NameFull: Roy, Sukanta – PersonEntity: Name: NameFull: Srinivasan, R. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2008 Type: published Y: 2008 Identifiers: – Type: issn-print Value: 14373254 Numbering: – Type: volume Value: 97 – Type: issue Value: 2 Titles: – TitleFull: International Journal of Earth Sciences Type: main |
| ResultId | 1 |
