Academic Journal
The Permian Cornubian granite batholith, SW England; Part 2: Gravity anomalies, structure, and state of isostasy
| العنوان: | The Permian Cornubian granite batholith, SW England; Part 2: Gravity anomalies, structure, and state of isostasy |
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| المؤلفون: | Watts, AB, Xu, C, Searle, MP, Jurkowski, C, Shail, RK |
| بيانات النشر: | Geological Society of America |
| سنة النشر: | 2024 |
| المجموعة: | University of Exeter: Open Research Exeter (ORE) |
| مصطلحات موضوعية: | Bouguer anomalies, Cornubian Batholith, Granites, Gravity anomalies, Igneous rocks, Inverse problem, Metamorphic rocks, Metasedimentary rocks, Mohorovicic discontinuity, Paleozoic, Permian, Plutonic rocks, Structural analysis, Topography |
| الوصف: | This is the author accepted manuscript. The final version is available from Geological Society of America via the DOI in this record. ; A new compilation of Bouguer gravity anomaly data has been used, together with forward and inverse modeling, to reappraise the structure, volume, and state of isostasy of the Cornubian batholith of SW England. We show the individual plutons that comprise the batholith are, on average, ∼10−11 km thick, are outward-sloping in their upper 2−3 km, and are underlain by roots which protrude downward into the middle crust. The batholith volume is estimated within the range of 76,367 ± 17,286 km3, significantly larger than previous estimates. Granite outcrops correlate with elevated topography, and mass balance calculations show that the mass deficiency of the granites relative to their host metasedimentary rocks is approximately equal to the mass excess of the topography relative to air. The existence of roots beneath individual plutons is in general agreement with predictions of an Airy model of isostasy and a depth of compensation that is within the crust rather than at the Moho. In addition, a middle crust compensation depth is compatible with the origin of the granites by heating and melting of metasedimentary rocks and with data from experimental rock mechanics which suggest that at the melting temperature and pressure of granite formation, deformation is likely to be plastic and controlled by glide along dislocations. During pluton emplacement the middle crust would, therefore, have acted as a mechanically weak layer, effectively decoupling the topography from any support it might otherwise have received from the lower crust and/or upper mantle. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0016-7606 1943-2674 |
| Relation: | Geological Society of America Bulletin; orcid:0000-0001-7200-5124 (Shail, RK); Published 5 April 2024; https://doi.org/10.1130/b37459.1; http://hdl.handle.net/10871/136942 |
| DOI: | 10.1130/b37459.1 |
| الاتاحة: | http://hdl.handle.net/10871/136942 https://doi.org/10.1130/b37459.1 |
| Rights: | © 2024 The author(s) This version is made available under the CC-BY licence: https://creativecommons.org/licenses/by/4.0/ ; https://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: | edsbas.1567BFAC |
| قاعدة البيانات: | BASE |
| تدمد: | 00167606 19432674 |
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| DOI: | 10.1130/b37459.1 |