Syn?Orogenic Exhumation of High?P Units by Upward Extrusion in an Accretionary Wedge: Insights From the Eastern Elba Nappe Stack (Northern Apennines, Italy)
نویسندگان
چکیده
The E-vergent Northern Apennines formed by Oligocene-Miocene convergence and westward subduction of Adria beneath Europe. Extension ensued in the Mid-Late Miocene reflecting lower plate roll-back causing opening back-arc Tyrrhenian Sea. Post-orogenic extension is commonly advocated as main driver exhumation belt's inner domain high-pressure/low-temperature (HP-LT) rock units. Acquadolce Subunit Eastern Elba nappe stack contains HP-LT rocks recording peak blueschist conditions 1.5–1.8 GPa at 320°C–370°C loosely dated to Oligocene-Early Miocene. It sandwiched two Late Miocene, out-of-sequence top-to-the E thrusts between Jurassic LP serpentinites on top HT–LP contact metamorphosed marbles its base. We document widespread W-verging ductile asymmetries within Subunit, which correspond W extensional shearing for current orientation. This allowed early syn-orogenic from blueschist- greenschist-facies conditions, wherein coeval W-directed exhuming units acted synchronously with E-directed thrusting their base extrusion an overall contractional setting. basal, is, however, challenging wedge has since been reworked E-verging compressive tectonics, metamorphism, later extension, obliterating much evidence supporting during stages build-up. Syn-orogenic deep structural levels orogenic a viable mechanism account other exhumed part belt.
منابع مشابه
Isotropic and anisotropic seismic structures across Northern Apennines (Italy)
7 Isotropic and anisotropic seismic structures across Northern Apennines (Italy) 8 subduction zone are imaged using a new method for the analysis of teleseismc 9 receiver functions (RFs). More than 13,000 P-wave coda of teleseismic records 10 from the 2003-2007 RETREAT experiment are able to reveal new insights 11 into a peculiar subduction zone which develops at the convergent margin of 12 two...
متن کاملstudy of cohesive devices in the textbook of english for the students of apsychology by rastegarpour
this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...
Mapping seismic anisotropy using harmonic decomposition of receiver functions: An application to Northern Apennines, Italy
[1] Isotropic and anisotropic seismic structures across the Northern Apennines (Italy) subduction zone are imaged using a new method for the analysis of teleseismic receiver functions (RFs). More than 13,000 P‐wave coda of teleseismic records from the 2003–2007 Retreating‐Trench, Extension, and Accretion Tectonics (RETREAT) experiment are used to provide new insights into a peculiar subduction ...
متن کاملFrom nappe stacking to exhumation: Cretaceous tectonics in the Apuseni Mountains (Romania)
New Ar-Ar muscovite and Rb-Sr biotite age data in combination with structural analyses from the Apuseni Mountains provide new constraints on the timing and kinematics of deformation during the Cretaceous. Time-temperature paths from the structurally highest basement nappe of the Apuseni Mountains in combination with sedimentary data indicate exhumation and a position close to the surface after ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Tectonics
سال: 2021
ISSN: ['0278-7407', '1944-9194']
DOI: https://doi.org/10.1029/2020tc006348