Melt migration and melt-rock reaction in the Alpine-Apennine peridotites:Insights on mantle dynamics in extending lithosphere     

Elisabetta Rampone  Giulio Borghini  Valentin Basch 《地学前缘(英文版)》2020,11(1):151-166

The compositional variability of the lithospheric mantle at extensional settings is largely caused by the reactive percolation of uprising melts in the thermal boundary layer and in lithospheric environments.The Alpine-Apennine(A-A)ophiolites are predominantly constituted by mantle peridotites and are widely thought to represent analogs of the oceanic lithosphere formed at ocean/continent transition and slow-to ultraslow-spreading settings.Structural and geochemical studies on the A-A mantle peridotites have revealed that they preserve significant compositional and isotopic heterogeneity at variable scale,reflecting a long-lived multi-stage melt migration,intrusion and melt-rock interaction history,occurred at different lithospheric depths during progressive uplift.The A-A mantle peridotites thus constitute a unique window on mantle dynamics and lithosphere-asthenosphere interactions in very slow spreading environments.In this work,we review field,microstructural and chemical-isotopic evidence on the major stages of melt percolation and melt-rock interaction recorded by the A-A peridotites and discuss their consequences in creating chemical-isotopic heterogeneities at variable scales and enhancing weakening and deformation of the extending mantle.Focus will be on three most important stages:(i)old(pre-Jurassic)pyroxenite emplacement,and the significant isotopic modification induced in the host mantle by pyroxenite-derived melts,(ii)melt-peridotite interactions during Jurassic mantle exhumation,i.e.the open-system reactive porous flow at spinel facies depths causing bulk depletion(origin of reactive harzburgites and dunites),and the shallower melt impregnation which originated plagioclase-rich peridotites and an overall mantle refertilization.We infer that migrating melts largely originated as shallow,variably depleted,melt fractions,and acquired Si-rich composition by reactive dissolution of mantle pyroxenes during upward migration.Such melt-rock reaction processes share significant similarities with those documented in modern oceanic peridotites from slow-to ultraslow-spreading environments and track the progressive exhumation of large mantle sectors at shallow depths in oceanic settings where a thicker thermal boundary layer exists,as a consequence of slow-spreading rate.  相似文献   

Peculiarities of the Tectonomagmatic Processes in the Interaction Area between the Icelandic Plume and the Bight Transform Fault (North Atlantic)     

Skolotnev  S. G.  Peyve  A. A.  Sanfilippo  A.  Ivanenko  A. N.  Ligi  M.  Veklich  I. A.  Petracchini  L.  Basch  V.  Kuleshov  D. A.  Ferrando  C.  Dobrolyubov  V. N.  Sani  C.  Shkittin  N. A.  Bickert  M.  Dokashenko  S. A.  Muccini  F.  Yakovenko  E. S.  Palmiotto  C.  Cuffaro  M. 《Doklady Earth Sciences》2022,504(1):233-239

Doklady Earth Sciences - Geological and geophysical data collected during the 53rd cruise of the R/V Akademik Sergey Vavilov are presented. It is shown that the lateral distribution of the...  相似文献   

Geological-Geophysical Investigations in the North Atlantic during Cruise 53 of the R/V Akademik Sergey Vavilov     

Skolotnev  S. G.  Peyve  A. A.  Sanfilippo  A.  Ivanenko  A. N.  Ligi  M.  Veklich  I. A.  Petracchini  L.  Ponomarenko  E. P.  Basch  V.  Kuleshov  D. A.  Ferrando  C.  Dobrolyubov  V. N.  Sani  C.  Shkittin  N. A.  Bickert  M.  Dokashenko  S. A.  Muccini  F.  Yakovenko  E. S.  Palmiotto  C.  Pugacheva  T. L.  Cuffaro  M. 《Oceanology》2022,62(4):575-577

Oceanology - We provide information on geological and geophysical investigations of the structure of the area between the Bight and Charlie Gibbs transform faults in the North Atlantic during...  相似文献   

Geological and Geophysical Studies of the Charlie Gibbs Fracture Zone (North Atlantic)     

Skolotnev  S. G.  Sanfilippo  A.  Peyve  A. A.  Nestola  Y.  Sokolov  S. Yu.  Petracchini  L.  Dobrolybova  K. O.  Basch  V.  Pertsev  A. N.  Ferrando  C.  Ivanenko  A. N.  Sani  C.  Razumovskii  A. A.  Muccini  F.  Bich  A. S.  Palmiotto  C.  Brusilovsky  Y. V.  Bonatti  E.  Sholukhov  K. N.  Cuffaro  M.  Veklich  I. A.  Ligi  M.  Dobrolybov  V. N. 《Doklady Earth Sciences》2021,497(1):191-194

Doklady Earth Sciences - The geological and geophysical data obtained during the 50th cruise of R/V Akademik Nikolaj Strakhov on the Charlie Gibbs megatransform system structure...  相似文献   

New Data on the Geological Structure of the Eastern Flank of the Charlie Gibbs Fracture Zone (North Atlantic)     

Skolotnev  S. G.  Peyve  A. A.  Ivanenko  A. N.  Dobrolyubova  K. O.  Sanfilippo  A.  Ligi  M.  Sokolov  S. Yu.  Veklich  I. A.  Petracchini  L.  Basch  V.  Ferrando  C.  Sani  C.  Bickert  M.  Muccini  F.  Palmiotto  C.  Cuffaro  M.  Kuleshov  D. A.  Dobrolyubov  V. N.  Shkittin  N. A.  Dokashenko  S. A.  Yakovenko  E. S. 《Doklady Earth Sciences》2022,504(2):333-337

Doklady Earth Sciences - The geological structure of a large volcanic edifice in the eastern flank of the large Charlie Gibbs Fracture Zone in the region of the Eastern Thule submarine rise (North...  相似文献   

Algorithms for GPS operation indoors and downtown   总被引：6，自引：0，他引：6  

Nainesh Agarwal  Julien Basch  Paul Beckmann  Piyush Bharti  Scott Bloebaum  Stefano Casadei  Andrew Chou  Per Enge  Wungkum Fong  Neesha Hathi  Wallace Mann  Anant Sahai  Jesse Stone  John Tsitsiklis  Benjamin Van Roy 《GPS Solutions》2002,6(3):149-160

The proliferation of mobile devices and the emergence of wireless location-based services has generated consumer demand for availability of GPS in urban and indoor environments. This demand calls for enhanced GPS algorithms that accommodate high degrees of signal attenuation and multipath effects unique to the "urban channel." This paper overviews the market for location-based services and discusses algorithmic innovations that address challenges posed by urban environments. Electronic Publication  相似文献