Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians
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| Language: | English |
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Ohio University / OhioLINK
2015
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1439388136 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou14393881362021-08-03T06:32:47Z Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians Strack, Cody M. Geology Geochronology Southern Appalachians Alleghanian Orogeny Mafic enclaves Granite petrology Three undeformed, spatially related plutons were investigated to constrain their petrogenesis and to define their context in the magmatic history of the Southern Appalachians. New SHRIMP-RG 207Pb-corrected 206Pb/238U zircon ages are presented for the Danburg granite, Sandy Hill granite, and Delhi syenite. The Danburg and Sandy Hill plutons yielded statistically equivalent ages of 307.0±4.7 Ma and 304.7±3.0 Ma, respectively, whereas the Delhi syenite zircons yielded an age of 468.9±4.8Ma. The age for the Delhi intrusion contrasts with previous estimates that it was part of the Alleghanian or Acadian orogenies, which were based solely on field relations. Whole rock geochemistry of the Alleghanian-age Danburg and Sandy Hill granites are indicative of post-collisional granites; the Delhi geochemistry is most similar to anorogenic granitoids. Mafic enclaves are dispersed throughout the Danburg granite and are proposed to represent the presence of a quenched mafic melt that was coeval with the Danburg based on textural features, linear geochemical trends, and a statistically similar SHRIMP-RG 207Pb-corrected 206Pb/238U titanite age of 307.3±3.7Ma. Accessory mineral thermobarometry of 771±27°C and 6.5±1.7 kilobars for the Danburg granite and 765±50°C and 5.1±1.4 kilobars for the enclaves supports the interpretation of crystallization under similar conditions. A transpressional model of convergence between the Suwannee terrane and Laurentia with minor mantle involvement is the preferred tectonic setting due to documented major shear zones, largely granitic plutonism, and the presence of mafic enclaves. 2015-09-17 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1439388136 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1439388136 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Geology Geochronology Southern Appalachians Alleghanian Orogeny Mafic enclaves Granite petrology |
| spellingShingle |
Geology Geochronology Southern Appalachians Alleghanian Orogeny Mafic enclaves Granite petrology Strack, Cody M. Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians |
| author |
Strack, Cody M. |
| author_facet |
Strack, Cody M. |
| author_sort |
Strack, Cody M. |
| title |
Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians |
| title_short |
Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians |
| title_full |
Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians |
| title_fullStr |
Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians |
| title_full_unstemmed |
Petrologic Study of the Danburg, Sandy Hill, and Delhi Intrusions: Constraints on Magmatism in the Southern Appalachians |
| title_sort |
petrologic study of the danburg, sandy hill, and delhi intrusions: constraints on magmatism in the southern appalachians |
| publisher |
Ohio University / OhioLINK |
| publishDate |
2015 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1439388136 |
| work_keys_str_mv |
AT strackcodym petrologicstudyofthedanburgsandyhillanddelhiintrusionsconstraintsonmagmatisminthesouthernappalachians |
| _version_ |
1719438674364465152 |