Abstract
Partial melting of continental crust and granite genesis were investigated in the Camboriú region, south Brazil. Structural geology and geochemistry were used in order to characterize the link between the high Ba-Sr Itapema Granite (IG)and the syntectonic melting of orthogneisses and amphibolites of the Camboriú Complex (CC). The IG is a sheet-like intrusive body of biotite monzogranite to granodiorite with large amount of migmatitic amphibolite and gneiss xenoliths, and a well-developed magmatic foliation concordant with the main gneissic banding. Discordant, m-thick granitic dykes which crosscut the migmatitic sequence and transport magma and xenoliths to feed the IG main body mark the transition from the migmatitic to the magmatic system within the complex. Whole-rock geochemical data reveal important contamination and assimilation processes of xenoliths during IG magmatic flow which give rise to different facies and geochemical signatures. The generation of the IG is an example of a continuous exposure from source to sink formed through a continuous and efficient deformation-driven melting/extraction/transport system generated during coeval folding and anatexis of the CC metamorphic sequence.
| Original language | English |
|---|---|
| Pages (from-to) | 270-286 |
| Number of pages | 17 |
| Journal | Lithos |
| Volume | 340-341 |
| DOIs | |
| Publication status | Published - 1 Sep 2019 |
Keywords
- Extraction dykes
- Generation of crustal magmas
- Migmatitic system
Cite this
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From migmatite to magma - crustal melting and generation of granite in the Camboriú Complex, south Brazil. / Martini, Amós; Bitencourt, Maria de Fátima; Weinberg, Roberto F.; De Toni, Giuseppe Betino; Lauro, V. S.Nardi.
In: Lithos, Vol. 340-341, 01.09.2019, p. 270-286.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - From migmatite to magma - crustal melting and generation of granite in the Camboriú Complex, south Brazil
AU - Martini, Amós
AU - Bitencourt, Maria de Fátima
AU - Weinberg, Roberto F.
AU - De Toni, Giuseppe Betino
AU - Lauro, V. S.Nardi
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Partial melting of continental crust and granite genesis were investigated in the Camboriú region, south Brazil. Structural geology and geochemistry were used in order to characterize the link between the high Ba-Sr Itapema Granite (IG)and the syntectonic melting of orthogneisses and amphibolites of the Camboriú Complex (CC). The IG is a sheet-like intrusive body of biotite monzogranite to granodiorite with large amount of migmatitic amphibolite and gneiss xenoliths, and a well-developed magmatic foliation concordant with the main gneissic banding. Discordant, m-thick granitic dykes which crosscut the migmatitic sequence and transport magma and xenoliths to feed the IG main body mark the transition from the migmatitic to the magmatic system within the complex. Whole-rock geochemical data reveal important contamination and assimilation processes of xenoliths during IG magmatic flow which give rise to different facies and geochemical signatures. The generation of the IG is an example of a continuous exposure from source to sink formed through a continuous and efficient deformation-driven melting/extraction/transport system generated during coeval folding and anatexis of the CC metamorphic sequence.
AB - Partial melting of continental crust and granite genesis were investigated in the Camboriú region, south Brazil. Structural geology and geochemistry were used in order to characterize the link between the high Ba-Sr Itapema Granite (IG)and the syntectonic melting of orthogneisses and amphibolites of the Camboriú Complex (CC). The IG is a sheet-like intrusive body of biotite monzogranite to granodiorite with large amount of migmatitic amphibolite and gneiss xenoliths, and a well-developed magmatic foliation concordant with the main gneissic banding. Discordant, m-thick granitic dykes which crosscut the migmatitic sequence and transport magma and xenoliths to feed the IG main body mark the transition from the migmatitic to the magmatic system within the complex. Whole-rock geochemical data reveal important contamination and assimilation processes of xenoliths during IG magmatic flow which give rise to different facies and geochemical signatures. The generation of the IG is an example of a continuous exposure from source to sink formed through a continuous and efficient deformation-driven melting/extraction/transport system generated during coeval folding and anatexis of the CC metamorphic sequence.
KW - Extraction dykes
KW - Generation of crustal magmas
KW - Migmatitic system
UR - http://www.scopus.com/inward/record.url?scp=85066235666&partnerID=8YFLogxK
U2 - 10.1016/j.lithos.2019.05.017
DO - 10.1016/j.lithos.2019.05.017
M3 - Article
VL - 340-341
SP - 270
EP - 286
JO - Lithos
JF - Lithos
SN - 0024-4937
ER -