Is the inverted field gradient in the Catalina Schist Terrane primary or constructional?

Platt, J. P.; Schmidt, William L.

doi:10.22541/essoar.169111678.88422505/v1

Cited by 1 publication

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“…Please cite these data as J. Platt & Schmidt, 2023. Laser Raman analysis of carbonaceous material, Catalina subduction complex, California, Version 1.0.…”

Section: Data Availability Statementmentioning

confidence: 99%

Is the Inverted Field Gradient in the Catalina Schist Terrane Primary or Constructional?

Platt,

Schmidt

2024

Tectonics

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New geothermometry using laser‐Raman data on carbonaceous material from low and intermediate grade rocks on Santa Catalina Island, California, together with existing thermobarometric data, show that there is a quasi‐continuous increase in peak metamorphic temperature from 327 ± 8°C in lawsonite blueschist facies rocks at the lowest structural levels, through ∼433°C in overlying epidote blueschists, 546 ± 20°C in albite‐epidote amphibolite facies rocks, to 650–730°C in amphibolite facies rocks at the top of the sequence. Rocks of different metamorphic grade are separated from one another by tectonic contacts across which temperature increases by ∼100°C in each case. Previously published geochronological data indicate that peak metamorphism in the highest grade rocks at 115 Ma preceded deposition of blueschist facies metasediments by ∼15 million years, so that the present inverted grade sequence does not represent an original inverted temperature gradient. The present structure results from progressive underplating of oceanic rocks in a cooling subduction zone following a high‐T metamorphic event at 115 Ma. An inverted temperature gradient of ≥100°C/km across the subduction channel likely existed during the high‐T event, decreased during underplating, and reached zero by ∼90 Ma.

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“…Please cite these data as J. Platt & Schmidt, 2023. Laser Raman analysis of carbonaceous material, Catalina subduction complex, California, Version 1.0.…”

Section: Data Availability Statementmentioning

confidence: 99%

Is the Inverted Field Gradient in the Catalina Schist Terrane Primary or Constructional?

Platt,

Schmidt

2024

Tectonics

View full text Add to dashboard Cite

show abstract

Is the inverted field gradient in the Catalina Schist Terrane primary or constructional?

Cited by 1 publication

References 45 publications

Is the Inverted Field Gradient in the Catalina Schist Terrane Primary or Constructional?

Is the Inverted Field Gradient in the Catalina Schist Terrane Primary or Constructional?

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