Sites U1547 and U1548

Teske, Andreas; Lizarralde, D.; Höfig, T.W.; Aiello, Ivano; Ash, Jeanine L.; Bojanova, D.P.; Buatier, Martine; Edgcomb, Virginia P.; Galerne, Christophe; Gontharet, S.; Heuer, Verena B; Jiang, Shijun; Kars, Myriam; Singh, Suniti; Kim, J.; Koornneef, L.M.T.; Marsaglia, Kathleen M.; Meyer, N.R.; Morono, Yuki; Negrete-Aranda, R.; Neumann, Florian; Pastor, Lucie; Peña-Salinas, M.E.; Cruz, L.L. Pérez; Ran, Lihua; Riboulleau, Armelle; Sarao, J.A.; Schubert, F.; Stock, J. M.; Toffin, Laurent; Xie, W.; Yamanaka, Toshiro; Zhuang, Guang‐Chao

doi:10.14379/iodp.proc.385.105.2021

Cited by 16 publications

(20 citation statements)

References 28 publications

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“…In IODP Expedition 385 Sites 1,545, 1,549 and 1,552, methane is the dominant (99.68%–99.97%) hydrocarbon gas in the top ∼100 m of the sediment column (Teske et al., 2021b). We also consider two mixed‐gas hydrate systems containing 91% methane, 8% carbon dioxide, and 1% ethane based on gas concentrations measured at 20 mbsf in the DSDP Hole 481A (Shipboard Scientific Party DSDP 64, 1982) and 98% methane, and 2% ethane based on measurements at 120 mbsf in the IODP Expedition 385 Site 1547 (Teske et al., 2021c). The presence of higher hydrocarbons increases the stability of the hydrate.…”

Section: Resultsmentioning

confidence: 99%

Thermal State of the Guaymas Basin Derived From Gas Hydrate Bottom Simulating Reflections and Heat Flow Measurements

et al. 2022

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Seafloor heat flow provides information about the thermal evolution of the lithosphere, the magnitude and timing of volcanic activity, and hydrothermal circulation patterns. In the central Gulf of California, the Guaymas Basin is part of a young marginal spreading rift system that experiences high sedimentation (1-5 km/Myr) and widespread magmatic intrusions in the axial troughs and the off-axis regions. Heat flow variations record magmatic and sedimentary processes affecting the thermal evolution of the basin. Here, we present new seismic evidence of a widespread bottom-simulating reflection (BSR) in the northwestern Guaymas Basin. Using the BSR depths and thermal conductivity measurements, we determine geothermal gradient and surface heat flow variations. The BSR-derived heat flow values are less than the conductive lithospheric heat flow predictions for mid-oceanic ridges. They suggest that high sedimentation (0.3-1 km/Myr) suppresses the lithospheric heat flow. In the central and southeastern regions of the basin, the BSR-derived geothermal gradient increases as the intruded magmatic units reach shallower subsurface depths. Thermal modeling shows that recent (<5,000 years) igneous intrusions (<500 m below the seafloor) and associated fluid flow elevate the surface heat flow up to five times. BSR-derived geothermal gradients correlate little with the depth of the shallowest magmatic emplacements to the north, where the intrusions have already cooled for some time, and the associated hydrothermal activity is about to shut down.

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Section: Resultsmentioning

confidence: 99%

Thermal State of the Guaymas Basin Derived From Gas Hydrate Bottom Simulating Reflections and Heat Flow Measurements

et al. 2022

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“…The conic sheet intrusion, however, must be considerably younger than those ages given the presence of abundant calcite‐filled cracks and peperite breccia in the cores above the sill (Teske et al, 2021e). The absence of pillow lavas in the cores further supports the conclusion that the sill intruded into fluid‐saturated, unconsolidated sediments (Teske et al, 2021e). Geilert et al (2018) estimated from ceased fluid mobilization, an age of 3–24 kyr; however, our new data can safely dismiss the lower bound estimate given the weak convective regime currently observed.…”

Section: Discussionmentioning

confidence: 99%

“…1 km) of Ringvent (Figure 1b). Both holes, U1548D‐E, were drilled to characterise the geochemical signature of an observed lateral change in sediment strata which may be related to the sill intrusion at Ringvent (Teske et al, 2021e).…”

Section: Guaymas Basinmentioning

confidence: 99%

Heat flow and thermal regime in the Guaymas Basin, Gulf of California: Estimates of conductive and advective heat transport

et al. 2023

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Heat flow is estimated at eight sites drilled int the Guaymas Basin, Gulf of California, during the International Ocean Discovery Program Expedition 385. The expedition sought to understand the thermal regime of the basin and heat transfer between off‐axis sills intruding the organic‐rich sediments of the Guaymas Basin, and the basin floor. The distinct sedimentation rates, active tectonics, and magmatism make the basin interesting for scientific discoveries. Results show that sedimentation corrected heat flow values range 119–221 mW/m2 in the basin and 257–1003 mW/m2 at the site of a young sill intrusion, denominated Ringvent. Thermal analysis shows that heat in the Guaymas Basin is being dissipated by conduction for plate ages >0.2 Ma, whereas younger plate ages are in a state of transient cooling by both conduction and advection. Drilling sites show that Ringvent is an active sill being cooled down slowly by circulating fluids with discharge velocities of 10–200 mm/yr. Possible recharge sites are located ca. 1 km away from the sill's border. Modelling of the heat output at Ringvent indicates a sill thickness of ca. 240 m. A simple order‐of‐magnitude model predicts that relatively small amounts of magma are needed to account for the elevated heat flow in non‐volcanic, sediment‐filled rifts like the central and northern Gulf of California in which heating of the upper crust is achieved via advection by sill emplacement and hydrothermal circulation. Multiple timescales of cooling control the crustal, chemical and biological evolution of the Guaymas Basin. Here, we recognize at least four timescales: the time interval between intrusions (ca. 103 yr), the thermal relaxation time of sills (ca. 104 yr), the characteristic cooling time of the sediments (ca. 105 yr), and the cooling of the entire crust at geologic timescales.

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“…Site U1547 targeted the hot, shallow-emplaced sill at Ringvent. Site U1548 sampled the Ringvent periphery with a series of holes drilled across the hydrothermal gradient outside the ring structure guided by the abrupt lateral change in seismic character observed in these sediments: Holes U1548A-U1548C are considered peripheral to the hot Ringvent sill, and Holes U1548D and U1548E recovered cooler sediments at a greater distance from Ringvent (Teske et al, 2021e).…”

Section: Sites U1547 and U1548mentioning

confidence: 99%

“…The sediments recovered at Sites U1547 and U1548 are dominated by diatom oozes, with a larger proportion of siliciclastic components relative to Sites U1545 and U1546. The sediment from the various holes drilled exhibits variations in the diagenetic stages of biogenic silica and authigenic carbonate precipitation, which may be responding to temperature-driven reactions associated with the Ringvent structure (Teske et al, 2021e).…”

Section: Sites U1547 and U1548mentioning

confidence: 99%

Data report: concentration and carbon isotopic composition in pore fluids from IODP Expedition 385

Torres¹,

Kim²

2022

Proceedings of the International Ocean Discovery Program

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Sites U1547 and U1548

Abstract: Contents 1 Summary 11 Background and objectives 13 Operations 18 Lithostratigraphy 31 Igneous petrology and alteration 46 Structural geology 49 Biostratigraphy 52 Paleomagnetism 62 Inorganic geochemistry 69 Organic geochemistry 79 Microbiology 84 Petrophysics 96 References

Cited by 16 publications

References 28 publications

Thermal State of the Guaymas Basin Derived From Gas Hydrate Bottom Simulating Reflections and Heat Flow Measurements

Thermal State of the Guaymas Basin Derived From Gas Hydrate Bottom Simulating Reflections and Heat Flow Measurements

Heat flow and thermal regime in the Guaymas Basin, Gulf of California: Estimates of conductive and advective heat transport

Data report: concentration and carbon isotopic composition in pore fluids from IODP Expedition 385

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