Julian A. Pearce
Cardiff University
GeologyBasaltGeochemistrySubductionMantle (geology)
What is this?
Publications 204
#1Julian A. Pearce (Cardiff University)H-Index: 60
#2Mark K. Reagan (UI: University of Iowa)H-Index: 36
1 CitationsSource
#1Julian A. PearceH-Index: 60
#2Mark K. ReaganH-Index: 36
Geosphere, August 2019, v. 15, no. 4, 1008–1037, doi:10.1130/GES01661.1, Supplemental Files. Supplemental File 1 (.pdf document): Geological settings and SiO2-MgO-TiO2 classification plots for the “testing set” of Anthropocene to Eoarchean low-Ti lavas and dikes. Supplemental File 2 (Excel spreadsheet): Templates for plotting the boninite classification diagrams developed in this paper.
#1Hongyan Li (CAS: Chinese Academy of Sciences)H-Index: 15
#2Rex N. Taylor (University of Southampton)H-Index: 35
Last. Julian A. Pearce (Cardiff University)H-Index: 60
view all 9 authors...
Subduction initiation is one of the least understood aspects of plate tectonics. In an effort to obtain the first in situ magmatic record of subduction initiation, the International Ocean Discovery Program Expedition 352 drilled at four sites in the inner trench wall of the Bonin Trench to recover 1.22 km of oceanic upper crust accreted within a few m.y. of subduction initiation. The two sites nearer to the trench (U1440 and U1441) yielded axial and off-axis fore-arc basalts (FAB), while those c...
3 CitationsSource
#1Richard J. ArculusH-Index: 56
#2Michael GurnisH-Index: 65
Last. Rupert SutherlandH-Index: 36
view all 6 authors...
The association of deep-sea trenches—steeply angled, planar zones where earthquakes occur deep into Earth’s interior—and chains, or arcs, of active, explosive volcanoes had been recognized for 90 years prior to the development of plate tectonic theory in the 1960s. Oceanic lithosphere is created at mid-ocean ridge spreading centers and recycled into the mantle at subduction zones, where down-going lithospheric plates dynamically sustain the deep-sea trenches. Study of subduction zone initiation ...
1 CitationsSource
#1Peng-Fei Zhang (HKU: University of Hong Kong)H-Index: 4
#2Mei-Fu Zhou (HKU: University of Hong Kong)H-Index: 71
Last. Xiaoping Xia (CAS: Chinese Academy of Sciences)H-Index: 34
view all 7 authors...
Abstract The Li-O isotopes of olivine and pyroxene from the mantle sequence of the Luobusa ophiolite, a fragment of Neo-Tethyan forearc lithosphere in Tibet, reveal a series of magmatic processes and geochemical evolution in a nascent mantle wedge during subduction initiation. Olivine grains from the ophiolitic mantle sequence display δ 18 O values similar to those of normal mantle (+5.18 ± 0.2‰), but have large δ 7 Li variations, ∼+4‰ to +13‰ in harzburgites and ∼+1‰ to +11‰ in high-Cr chromiti...
3 CitationsSource
#1Mark K. Reagan (UI: University of Iowa)H-Index: 36
#2Daniel E. Heaton (OSU: Oregon State University)H-Index: 7
Last. Anthony A. P. Koppers (OSU: Oregon State University)H-Index: 31
view all 6 authors...
Abstract The Izu–Bonin–Mariana (IBM) forearc contains a record of a widespread and short-lived subduction initiation event in the early Eocene. We present new high-precision ages to determine the rates and length scales of ocean crust production following subduction initiation along the IBM convergent margin. We also explore the implications of these ages for potential causes of subduction initiation and its far-field effects. Zircons extracted from gabbros collected by Shinkai 6500 diving withi...
11 CitationsSource
#1Mark K. ReaganH-Index: 36
#3Julian A. PearceH-Index: 60
#1John W. Shervais (USU: Utah State University)H-Index: 31
#2Mark K. Reagan (UI: University of Iowa)H-Index: 36
Last. Scott K. Vetter (Centenary College of Louisiana)H-Index: 8
view all 19 authors...
The Izu‐Bonin‐Mariana (IBM) fore arc preserves igneous rock assemblages that formed during subduction initiation circa 52 Ma. International Ocean Discovery Program (IODP) Expedition 352 cored four sites in the fore arc near the Ogasawara Plateau in order to document the magmatic response to subduction initiation and the physical, petrologic, and chemical stratigraphy of a nascent subduction zone. Two of these sites (U1440 and U1441) are underlain by fore‐arc basalt (FAB). FABs have mid‐ocean rid...
5 CitationsSource
#3Robert J. SternH-Index: 71
Last. Julian A. PearceH-Index: 60
view all 4 authors...
#1John W. ShervaisH-Index: 31
#2Mark K. ReaganH-Index: 36
Last. Scott K. VetterH-Index: 8
view all 19 authors...