Relative Motions Between Oceanic and Continental Plates in the Pacific Basin

Engebretson, David C.; Cox, Allan; Gordon, Richard G.

doi:10.1130/spe206-p1

Cited by 1,231 publications

(1,181 citation statements)

References 0 publications

Supporting

Mentioning

1,088

Contrasting

Unclassified

Order By: Relevance

“…Lavas emplaced between 22 and 12 Ma may have resulted from this reorganization, which might have involved changes in the rate of convergence of the plates and the subduction angle. Gómez-Tuena and Carrasco-Núñez (2000) proposed that this subduction scenario started at about 20 Ma with a high convergence rate of 120 mm/yr (Engebretson et al, 1985) and a very shallow dip-angle of about 11°, which might eventually cause the production of magmas after more than 5 Ma at very distal areas from the trench. However, no petrogenetic relationships were tested by these authors using geochemical modeling.…”

Section: Broader Implicationsmentioning

confidence: 99%

Reappraisal of the Geology and Geochemistry of Volcán Zamorano, Central Mexico: Implications for Discriminating the Sierra Madre Occidental and Mexican Volcanic Belt Provinces

Verma

Carrasco-Núñez

2003

International Geology Review

View full text Add to dashboard Cite

We report new geological, 40 Ar/ 39 Ar geochronology, and geochemical data (major and trace elements, and Sr, Nd, and Pb isotopic ratios) on andesitic to dacitic rocks collected from Volcán Zamorano and on rhyolitic ignimbrites from the surrounding area. These data better constrain the relationship of two major volcanic provinces of Mexico: the mid-Tertiary Sierra Madre Occidental (SMO) and the Miocene to Recent Mexican Volcanic Belt (MVB). Structurally, the SMO and MVB show different extensional styles. The SMO was affected by east-west extension mainly during the Oligocene and middle Miocene, whereas the MVB was affected by extensional deformation during middle-to-late Miocene and Plio-Quaternary times, although reactivation of the older structural systems, such as the NNW-SSE system, has occurred in more recent times. The new geological data from the study area are consistent with the 40 Ar/ 39 Ar dates. The andesitic and dacitic rocks from Volcán Zamorano are about 10 Ma. These rocks, along with nearby andesitic and basaltic volcanoes, mark a relatively early phase of the MVB. (about 18.84-18.87, 15.65, and 38.78-38.82, respectively) than for basaltic to dacitic rocks from Volcán Zamorano and the surrounding area. Most studied rocks from both provinces seem to contain a crustal component. The ignimbrites are chemically and isotopically similar to rhyolitic and ignimbritic rocks sampled from other areas of the SMO. Our study of Volcán Zamorano shows that the transition from SMO to MVB was rather sudden and not a gradual process.

show abstract

Section: Broader Implicationsmentioning

confidence: 99%

Reappraisal of the Geology and Geochemistry of Volcán Zamorano, Central Mexico: Implications for Discriminating the Sierra Madre Occidental and Mexican Volcanic Belt Provinces

Verma

Carrasco-Núñez

2003

International Geology Review

View full text Add to dashboard Cite

show abstract

“…This difference may be due to the limited quantity of paleostress data available; however, I will argue in Section 4.5 that it represents a Figure 1. Schematic and qualitative tectonic history, based on Engebretson et al [1985], de Cserna [1989, Axen et al [1993], and Bird [1998]. No palinspastic restoration is attempted (except in the Pacific basin).…”

Section: Interpolation and Comparisonmentioning

confidence: 99%

Stress direction history of the western United States and Mexico since 85 Ma

Bird

2002

Tectonics

View full text Add to dashboard Cite

[1] A data set of 369 paleostress direction indicators (sets of dikes, veins, or fault slip vectors) is collected from previous compilations and the geologic literature. Like contemporary data, these stress directions show great variability, even over short distances. Therefore statistical methods are helpful in deciding which apparent variations in space or in time are significant. First, the interpolation technique of Bird and Li [1996] is used to interpolate stress directions to a grid of evenly spaced points in each of seventeen 5-m.y. time steps since 85 Ma. Then, a t test is used to search for stress direction changes between pairs of time windows whose sense can be determined with some minimum confidence. Available data cannot resolve local stress provinces, and only the broadest changes affecting country-sized regions are reasonably certain. During 85 -50 Ma, the most compressive horizontal stress azimuthŝ 1H was fairly constant at $68°(United States) to 75°(Mexico). During 50 -35 Ma, both counterclockwise stress changes (in the Pacific Northwest) and clockwise stress changes (from Nevada to New Mexico) are seen, but only locally and with about 50% confidence. A major stress azimuth change by $90°occurred at 33 ± 2 Ma in Mexico and at 30 ± 2 Ma in the western United States. This was probably an interchange between s 1 andŝ 3 caused by a decrease in horizontal compression and/or an increase in vertical compression. The most likely cause was the rollback of horizontally subducting Farallon slab from under the southwestern United States and northwest Mexico, which was rapid during 35 -25 Ma. After this transition, a clockwise rotation of principal stress axes by 36°-48°occurred more gradually since 22 Ma, affecting the region between latitudes 28°N and 41°N. This occurred as the lengthening Pacific/North America transform boundary gradually added dextral shear on northwest striking planes to the previous stress field of SW-NE extension.

show abstract

“…경상분지의 발달초기 즉, 백악기 초인 약 140 Ma 경에는 패러론(Farallon)판과 이자나기(Izanagi)판 사 이의 남북 주향을 가지는 해령경계가 유라시아 대륙 의 동변부에 도착하였을 가능성이 높다 (Engebretson et al, 1985). 이후 백악기 동안 유라시아판 아래로 이자나기-태평양판의 섭입과 관련된 화성활동이 동아 시아 일원에 광범위하게 일어났으며 (Chough and Sohn, 2010), 이로 인한 코디레라-형 조산운동은 강력 한 중성-산성의 화성활동을 발생시켜 유라시아 대륙의 지각성장의 원인이 된 것으로 알려져 있다 (Rogers, 1993).…”

Section: 남한의 백악기 화강암류unclassified

“…-남남서 방향의 해구에 도달하여 섭입된 것으로 알려 져 있다 (Uyeda and Miyashiro, 1974;Hilde et al, 1977;Engebretson et al, 1985;Maruyama et al, 1997;Kinoshita, 2002;Chough and Sohn, 2010;Hwang et al, 2011). 당시의 해구와 해령은 Kinoshita (2002)의 연구결과에 따라 약 52 o 의 각도로 서로 사교 한 것으로 가정하였다 (Fig.…”

Section: -80 Ma 경에 유라시아 대륙의 동쪽 연변부에는 이자나기-태평양 해령(Izanagi-pacific Riunclassified

Cretaceous to Early Tertiary Granites and Magma Mixing in South Korea : Their Spatio-temporal Variations and Tectonic Implications (Multiple Slab Window Model)

Kim¹,

Kim²,

Jwa³

et al. 2012

The Journal of the Petrological Society of Korea

View full text Add to dashboard Cite

Based on the petrologic and age data of the Cretaceous to early Tertiary granites in south Korea, we propose a new tectonic model reflecting their temporal and spatial variations. A number of petrographic and geochemical studies on the granites suggest that they originated from the magma formed by subduction of oceanic crust in continental margin and were emplaced in epizone. The MMEs with various shapes and sizes, which were produced due to the magma mixing caused by the injection of mafic magma from mantle during the crystallization of the granitic magma, are observed in the granites. The distributions of the MMEs and ages of the granites show a distinctive spatio-temporal distribution pattern. The distribution pattern can be explained by a multiple slab window model related to the ridge subduction of Izanagi-Pacific plates during the Late Cretaceous.

show abstract

Relative Motions Between Oceanic and Continental Plates in the Pacific Basin

Cited by 1,231 publications

References 0 publications

Reappraisal of the Geology and Geochemistry of Volcán Zamorano, Central Mexico: Implications for Discriminating the Sierra Madre Occidental and Mexican Volcanic Belt Provinces

Reappraisal of the Geology and Geochemistry of Volcán Zamorano, Central Mexico: Implications for Discriminating the Sierra Madre Occidental and Mexican Volcanic Belt Provinces

Stress direction history of the western United States and Mexico since 85 Ma

Cretaceous to Early Tertiary Granites and Magma Mixing in South Korea : Their Spatio-temporal Variations and Tectonic Implications (Multiple Slab Window Model)

Contact Info

Product

Resources

About