Mark K. Reagan
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View article: A long section of serpentinized depleted mantle peridotite
A long section of serpentinized depleted mantle peridotite Open
The upper mantle is critical for our understanding of terrestrial magmatism, crust formation, and element cycling between Earth’s solid interior, hydrosphere, atmosphere, and biosphere. Mantle composition and evolution have been primarily …
View article: High-resolution decadal-scale eruption age dating of young oceanic basalts at an active hydrothermal vent site
High-resolution decadal-scale eruption age dating of young oceanic basalts at an active hydrothermal vent site Open
Here we report ( 210 Pb/ 226 Ra), ( 226 Ra/ 230 Th), ( 230 Th/ 238 U) and ( 234 U/ 238 U) disequilibria for eleven lavas from the ABE vent site in the Lau Basin. Most ABE lavas have ( 210 Pb/ 226 Ra) > 1 and ( 226 Ra/ 230 Th) > 3. Th…
View article: Evolution of Stromboli basaltic plumbing system via magma recharges and mush rejuvenation.
Evolution of Stromboli basaltic plumbing system via magma recharges and mush rejuvenation. Open
Basaltic volcanoes can remain active for tens to thousands of years with the continual presence of magma, requiring storage and transport conditions that can sustain persistently eruptible melt. Magma storage conditions beneath these volca…
View article: IODP Expedition 352, Hole U1439C - Well Logging Data
IODP Expedition 352, Hole U1439C - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 352, Hole U1442A - Well Logging Data
IODP Expedition 352, Hole U1442A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 352, Hole U1442A - Well Logging Data
IODP Expedition 352, Hole U1442A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 352, Hole U1439C - Well Logging Data
IODP Expedition 352, Hole U1439C - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: Covariation of Slab Tracers, Volatiles, and Oxidation During Subduction Initiation
Covariation of Slab Tracers, Volatiles, and Oxidation During Subduction Initiation Open
Subduction‐related lavas have higher Fe 3+ /∑Fe than midocean ridge basalts (MORB). Hypotheses for this offset include imprint from subducting slabs and differentiation in thickened crust. These ideas are readily tested through examination…
View article: IODP Expedition 352, Hole U1440B - Well Logging Data
IODP Expedition 352, Hole U1440B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 352, Hole U1440B - Well Logging Data
IODP Expedition 352, Hole U1440B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: Magmatic Response to Subduction Initiation, Part II: Boninites and Related Rocks of the Izu‐Bonin Arc From IODP Expedition 352
Magmatic Response to Subduction Initiation, Part II: Boninites and Related Rocks of the Izu‐Bonin Arc From IODP Expedition 352 Open
International Ocean Discovery Program Expedition 352 to the Izu‐Bonin forearc cored over 800 m of basement comprising boninite and boninite‐series lavas. This is the most extensive, well‐constrained suite of boninite series lavas ever obta…
View article: Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352)
Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) Open
International Ocean Discovery Program Expedition 352 to the Bonin forearc drilled the sequence of volcanic rocks erupted in the immediate aftermath of subduction initiation along the western margin of the Pacific Plate. Pristine volcanic g…
View article: Rapid subduction initiation and magmatism in the Western Pacific driven by internal vertical forces
Rapid subduction initiation and magmatism in the Western Pacific driven by internal vertical forces Open
Plate tectonics requires the formation of plate boundaries. Particularly important is the enigmatic initiation of subduction: the sliding of one plate below the other, and the primary driver of plate tectonics. A continuous, in situ record…
View article: Mineral compositions and thermobarometry of basalts and boninites recovered during IODP Expedition 352 to the Bonin forearc
Mineral compositions and thermobarometry of basalts and boninites recovered during IODP Expedition 352 to the Bonin forearc Open
Central aims of IODP Expedition 352 were to delineate and characterize the magmatic stratigraphy in the Bonin forearc to define key magmatic processes associated with subduction initiation and their potential links to ophiolites. Expeditio…
View article: Vertically Driven Dynamics and Magmatism of Rapid Subduction Initiation in the Western Pacific
Vertically Driven Dynamics and Magmatism of Rapid Subduction Initiation in the Western Pacific Open
<p><strong>Plate tectonics requires the formation of plate boundaries. Particularly important is the enigmatic initiation of subduction: the sliding of one plate below the other, and the primary driver of plate tectonics. A con…
View article: U-Series Histories of Magmatic Volatile Phases and Enclave Development at Soufrière Hills Volcano, Montserrat
U-Series Histories of Magmatic Volatile Phases and Enclave Development at Soufrière Hills Volcano, Montserrat Open
Injection of volatile-rich mafic magma prior to an eruption may trigger episodes of volcanism and can act to transfer metals from depth.During these events, the injected mafic magmas commonly cool and crystallize, host magmas may be heated…
View article: Major and trace element concentrations, stable isotope ratios, and water contents for volcanic glasses from the Bonin forearc (IODP Expedition 352)
Major and trace element concentrations, stable isotope ratios, and water contents for volcanic glasses from the Bonin forearc (IODP Expedition 352) Open
International Ocean Discovery Program Expedition 352 to the Bonin forearc drilled the sequence of volcanic rocks erupted in the immediate aftermath of subduction initiation along the western margin of the Pacific Plate. Pristine volcanic g…
View article: Postmagmatic Tectonic Evolution of the Outer Izu‐Bonin Forearc Revealed by Sediment Basin Structure and Vein Microstructure Analysis: Implications for a 15 Ma Hiatus Between Pacific Plate Subduction Initiation and Forearc Extension
Postmagmatic Tectonic Evolution of the Outer Izu‐Bonin Forearc Revealed by Sediment Basin Structure and Vein Microstructure Analysis: Implications for a 15 Ma Hiatus Between Pacific Plate Subduction Initiation and Forearc Extension Open
International Ocean Discovery Program Expedition 352 recovered sedimentary‐volcaniclastic successions and extensional structures (faults and extensional veins) that allow the reconstruction of the Izu‐Bonin forearc tectonic evolution using…
View article: Supplemental Material: Identification, classification, and interpretation of boninites from Anthropocene to Eoarchean using Si-Mg-Ti systematics
Supplemental Material: Identification, classification, and interpretation of boninites from Anthropocene to Eoarchean using Si-Mg-Ti systematics Open
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…
View article: Identification, classification, and interpretation of boninites from Anthropocene to Eoarchean using Si-Mg-Ti systematics
Identification, classification, and interpretation of boninites from Anthropocene to Eoarchean using Si-Mg-Ti systematics Open
Boninites are rare, high-Si, high-Mg, low-Ti lavas that have considerable tectonic significance, especially for recognizing and interpreting episodes of subduction initiation in the geologic record. Formal identification and classification…