ISPY SAN CRISTOBAL'S MAGMA SOURCE: THE GALAPAGOS ISLAND EDITION

2018 ◽  
Author(s):  
Regina Pimentel ◽  
◽  
Karen Harpp ◽  
Dennis Geist ◽  
Hannah Bercovici ◽  
...  
Keyword(s):  
Magma Source ◽  
Galapagos Island

SYSTEMATIC MIDDDLE TO LATE JURASSIC CHANGES IN MAGMA SOURCE IN THE MOJAVE SEGMENT OF CALIFORNIA’S CONTINENTAL ARC

2016 ◽  
Author(s):  
Jade Star Lackey ◽  
◽  
Kyle R. McCarty ◽  
Anne A. Fulton ◽  
Juliet Ryan-Davis ◽  
...  
Keyword(s):  
Late Jurassic ◽  
Magma Source ◽  
Continental Arc

scholarly journals Geochemical Variation of Miocene Basalts within Shikoku Basin: Magma Source Compositions and Geodynamic Implications

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
Shuang-Shuang Chen ◽  
Tong Hou ◽  
Jia-Qi Liu ◽  
Zhao-Chong Zhang
Keyword(s):  
Japan Sea ◽  
Isotopic Signature ◽  
Magma Source ◽  
Isotopic Compositions ◽  
Enriched Mantle ◽  
Shikoku Basin ◽  
Depleted Mantle ◽  
Parece Vela Basin ◽  
Back Arc ◽  
Ocean Ridge

Shikoku Basin is unique as being located within a trench-ridge-trench triple junction. Here, we report mineral compositions, major, trace-element, and Sr-Nd-Pb isotopic compositions of bulk-rocks from Sites C0012 (>18.9 Ma) and 1173 (13–15 Ma) of the Shikoku Basin. Samples from Sites C0012 and 1173 are tholeiitic in composition and display relative depletion in light rare earth elements (REEs) and enrichment in heavy REEs, generally similar to normal mid-ocean ridge basalts (N-MORB). Specifically, Site C0012 samples display more pronounced positive anomalies in Rb, Ba, K, Pb and Sr, and negative anomalies in Th, U, Nb, and Ta, as well as negative Nb relative to La and Th. Site 1173 basalts have relatively uniform Sr-Nd-Pb isotopic compositions, close to the end member of depleted mantle, while Site C0012 samples show slightly enriched Sr-Nd-Pb isotopic signature, indicating a possible involvement of enriched mantle 1 (EM1) and EM2 sources, which could be attributed to the metasomatism of the fluids released from the dehydrated subduction slab, but with the little involvement of subducted slab-derived sedimentary component. Additionally, the Shikoku Basin record the formation of the back-arc basin was a mantle conversion process from an island arc to a typical MORB. The formation of the Shikoku Basin is different from that of the adjacent Japan Sea and Parece Vela Basin, mainly in terms of the metasomatized subduction-related components, the nature of mantle source, and partial melting processes.

The relationship between the height of a volcano and the depth to its magma source zone: A critical reexamination

1992 ◽  
Vol 19 (13) ◽  
pp. 1395-1398 ◽  
Author(s):  
Lionel Wilson ◽  
James W. Head ◽  
Elisabeth A. Parfitt
Keyword(s):  
Source Zone ◽  
Magma Source ◽  
The Relationship

Collision and reactivation along the South Tianshan Orogen (NW China) through late Paleozoic to Mesozoic time

2021 ◽  
Author(s):  
Yigui Han ◽  
Guochun Zhao
Keyword(s):  
Continental Collision ◽  
Orogenic Belt ◽  
Late Paleozoic ◽  
Magma Source ◽  
The South ◽  
Nw China ◽  
Magmatic Rocks ◽  
Western Tianshan ◽  
Tarim Craton ◽  
South Tianshan

<p>The South Tianshan Orogenic Belt in NW China marks the suturing site between the Tarim Craton and the Central Asian Orogenic Belt (CAOB) during late Paleozoic-Mesozoic time. Despite numerous investigations, the amalgamation history along the South Tianshan Orogen remains controversial, especially on the timing and process of the final continental collision between the Tarim Craton and the Central Tianshan (CTS)-Yili Block. We inquire into this issue on the basis of a compiled dataset across the Tarim, South Tianshan and CTS-Yili regions, comprising elemental and isotopic data of magmatic rocks and radiometric ages of regional magmatism, detrital zircons, (ultra-)high pressure metamorphism and tectonothermal events. The data support a continental collision along the South Tianshan belt in 310-300 Ma, in accord with a contemporaneous magmatic quiescence and a prominent decrease of εNd(t) and εHf(t) values of magmatic rocks in the CTS region, and a main exhumation stage of (U)HP rocks in the South Tianshan region. The collisional orogeny along the South Tianshan have most likely been influenced by a mantle plume initiated at ca. 300 Ma underneath the northern Tarim Craton, as evidenced by temporal and spatial variations of geochemical proxies tracing magma source characteristics. The new model of plume-modified collision orogeny reconciles the absence of continental-type (U)HP rocks in the orogen and the insignificant upper-plate uplift during continental collision. In the mid-Triassic (ca. 240 Ma), the Chinese western Tianshan underwent intense surface uplift and denudation, as indicated by sedimentary provenance analysis and tectonothermal events. Paleocurrent and detrital zircon age data from Triassic strata in northern Tarim suggest a provenance change from a single source of the Tarim Craton to multiple sources including the CTS-Yili Block to the north and the Western Kunlun Orogen to the south. We suggest that the mid-Triassic uplifting in Chinese western Tianshan was an intracontinental orogeny caused by far-field effects of the collision between the Tarim Craton and the Qiangtang Block. This research was financially supported by NSFC Projects (41730213, 42072264, 41902229, 41972237) and Hong Kong RGC GRF (17307918).</p>

No man is an island: The sustainability awareness effect of geography on hedonic fashion consumption and connection with nature – evidence from Galápagos and Hawaiʻi

2021 ◽  
Vol 8 (1-2) ◽  
pp. 205-221
Author(s):  
Attila Pohlmann
Keyword(s):  
United States ◽  
Supply Chain ◽  
Natural Environment ◽  
The United States ◽  
Santa Cruz ◽  
Galapagos Island ◽  
Fast Fashion ◽  
Trade Off ◽  
Visual Evidence ◽  
Connection With Nature

The demand for ever-accelerating fast fashion is unprecedented, while its supply chain burdens environmental systems. Hedonic fashion consumption is generally unfettered by sustainability concerns, but evidence suggests that island geographies–with dense boundaries between the built and the natural environment–have a heightening effect on eco-consciousness. A framework based on the contemporary condition of hyperconsumption is proposed: island geography heightens sustainability awareness; consequently, fashion consumers located on islands trade-off perceived hedonic benefits of fashion consumption against perceived moral benefits of connection with nature. The framework is supported by visual evidence collected on the Galápagos island Santa Cruz, indicating that male fashion consumers express connection with nature by means of tattoos, slogans on clothing and choice of eco-friendly materials. Quantitative tests with survey data from the United States and Ecuador show that residents in Hawaiʻi and the Galápagos have higher levels of connection with nature compared to residents on the associated continental areas. This effect is mediated by decreased perceived rewards of hedonic fashion consumption, but the effect is overall weaker in Ecuador compared to the United States due to differences in purchasing power and attitudes towards consumerism. Because of the stereotype that eco-friendly is unmanly, men are generally less likely to embrace environmentally friendly products and the findings of this research point to avenues to overcome this barrier.

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