Draft:Ring Mountain (California)

Geology

Ring Mountain is a unique geological site, where rocks that formed in ancient subduction zones can be observed^[1]. Serpentinized peridotite crops out on the two summits of the mountain, and the steep upper slopes are underlain by serpentinite-matrix melange ^[2]. The melange contains blocks of high-pressure, low-temperature metamorphic rocks associated with subduction zone metamorphism. Melanges of this general style are known from the Franciscan Complex^[3], but this melange is particularly notable for the size and variety of the metamorphic blocks. Dating of metamorphic minerals in the blocks indicates that they were produced over a protracted history of subduction which began ~175 million years ago^[4]. The blocks preserve mineral assemblages characteristic of greenschist facies, blueschist facies, amphibolite facies, and eclogite facies metamorphism^[5]. The lower slopes are underlain by greywacke sandstones and shales of prehnite-pumpellyite metamorphic grade^[6].

The origins of the serpentinite-matrix melange, and the mechanism of mixing the metamorphic blocks of different ages and apparent thermal-burial histories, has been a matter of debate. Some authors argue that the metamorphic rocks were exposed at the surface, eroded and re-deposited into a subduction trench to form the melange as an olistostrome^[7]. Others interpret the melange as having formed in a subduction plate boundary where blocks of meta-basalt from the downgoing plate were mixed with serpentine from the upper plate mantle^[8].

^ Tsujimori; Matsumoto; Wakabayashi; Liou (2006). "Franciscan eclogite revisited: Reevaluation of the P-T evolution of tectonic blocks from Tiburon Peninsula, California, USA". Mineralogy and Petrology. 88 (1–2): 243. Retrieved 28 September 2019.
^ Bero, David A. (2014). "Geology of Ring Mountain and Tiburon Peninsula, Marin County, California". National Geologic Map Database. Retrieved 2019-09-28.{{cite web}}: CS1 maint: url-status (link)
^ Raymond, Loren (1 August 2019). "Origin of Mélanges of the Franciscan Complex, Diablo Range and Northern California: An Analysis and Review". geosciences. 9 (8): 338. Retrieved 1 October 2019.
^ Mulcahy, Sean R.; Starnes, Jesslyn K.; Day, Howard W.; Coble, Matthew A.; Vervoort, Jeffrey D. (2018). "Early Onset of Franciscan Subduction". Tectonics. 37 (5): 1194–1209. doi:10.1029/2017TC004753. ISSN 1944-9194.
^ Tsujimori, T.; Matsumoto, K.; Wakabayashi, J.; Liou, J. G. (2006-08-22). "Franciscan eclogite revisited: Reevaluation of the P–T evolution of tectonic blocks from Tiburon Peninsula, California, U.S.A." Mineralogy and Petrology. 88 (1): 243. doi:10.1007/s00710-006-0157-1. ISSN 1438-1168.
^ "Tectonostratigraphic Terranes of the San Francisco Bay Region". 1984. {{cite journal}}: Cite journal requires |journal= (help)
^ Wakabayashi, John (2012-09-28). "Subducted sedimentary serpentinite mélanges: Record of multiple burial–exhumation cycles and subduction erosion". Tectonophysics. Chaos and Geodynamics: Melanges, Melange Forming Processes and Their Significance in the Geological Record. 568–569: 230–247. doi:10.1016/j.tecto.2011.11.006. ISSN 0040-1951.
^ Ernst, W. G. (2016-04-03). "Franciscan mélanges: coherent blocks in a low-density, ductile matrix". International Geology Review. 58 (5): 626–642. doi:10.1080/00206814.2015.1108879. ISSN 0020-6814.

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Instructions · What links here · Ring Mountain (California) (talk: + · bio) · (log) · Copyvios report · reFill · Citation Bot · (Search: Google, Wikipedia) · Submitted 5 years ago by Christierowe (talk: D · +) · Last edited 5 years ago by Christierowe

Warning: The page Ring Mountain (California) already exists. Please ensure it is not a copy or that this page is located to the correct title.

[1] Tsujimori; Matsumoto; Wakabayashi; Liou (2006). "Franciscan eclogite revisited: Reevaluation of the P-T evolution of tectonic blocks from Tiburon Peninsula, California, USA". Mineralogy and Petrology. 88 (1–2): 243. Retrieved 28 September 2019.

[2] Bero, David A. (2014). "Geology of Ring Mountain and Tiburon Peninsula, Marin County, California". National Geologic Map Database. Retrieved 2019-09-28.{{cite web}}: CS1 maint: url-status (link)

[3] Raymond, Loren (1 August 2019). "Origin of Mélanges of the Franciscan Complex, Diablo Range and Northern California: An Analysis and Review". geosciences. 9 (8): 338. Retrieved 1 October 2019.

[4] Mulcahy, Sean R.; Starnes, Jesslyn K.; Day, Howard W.; Coble, Matthew A.; Vervoort, Jeffrey D. (2018). "Early Onset of Franciscan Subduction". Tectonics. 37 (5): 1194–1209. doi:10.1029/2017TC004753. ISSN 1944-9194.

[5] Tsujimori, T.; Matsumoto, K.; Wakabayashi, J.; Liou, J. G. (2006-08-22). "Franciscan eclogite revisited: Reevaluation of the P–T evolution of tectonic blocks from Tiburon Peninsula, California, U.S.A." Mineralogy and Petrology. 88 (1): 243. doi:10.1007/s00710-006-0157-1. ISSN 1438-1168.

[6] "Tectonostratigraphic Terranes of the San Francisco Bay Region". 1984. {{cite journal}}: Cite journal requires |journal= (help)

[7] Wakabayashi, John (2012-09-28). "Subducted sedimentary serpentinite mélanges: Record of multiple burial–exhumation cycles and subduction erosion". Tectonophysics. Chaos and Geodynamics: Melanges, Melange Forming Processes and Their Significance in the Geological Record. 568–569: 230–247. doi:10.1016/j.tecto.2011.11.006. ISSN 0040-1951.

[8] Ernst, W. G. (2016-04-03). "Franciscan mélanges: coherent blocks in a low-density, ductile matrix". International Geology Review. 58 (5): 626–642. doi:10.1080/00206814.2015.1108879. ISSN 0020-6814.

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