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Journal Article

Stratigraphy and structural development of the southwest Isla Tiburón marine basin: Implications for latest Miocene tectonic opening and flooding of the northern Gulf of California Open Access

Scott E.K. Bennett, Michael E. Oskin, Rebecca J. Dorsey, Alexander Iriondo, Michael J. Kunk
Journal: Geosphere
Published: 01 August 2015
Geosphere (2015) 11 (4): 977–1007.
DOI: https://doi.org/10.1130/GES01153.1
... and temporal evolution of strain accommodation across the obliquely divergent Pacific–North America plate boundary. Marine strata exposed on southwest Isla Tiburón (SWIT) have been cited as evidence for a middle Miocene marine incursion into the Gulf of California at least 7 m.y. prior to plate boundary...
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View PDF for article title, Stratigraphy and structural development of the southwest Isla <span class="search-highlight">Tiburón</span> marine basin: Implications for latest Miocene tectonic opening and flooding of the northern Gulf of California
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Journal Article

Upslope deposition of extremely distal turbidites: An example from the Tiburon Rise, west-central Atlantic Available to Purchase

James Dolan, Christian Beck, Yujiro Ogawa
Journal: Geology
Published: 01 November 1989
Geology (1989) 17 (11): 990–994.
DOI: https://doi.org/10.1130/0091-7613(1989)017<0990:UDOEDT>2.3.CO;2
...James Dolan; Christian Beck; Yujiro Ogawa Abstract Terrigenous silt and sand turbidites recovered from the crest of the Tiburon Rise in the west-central Atlantic represent an unprecedented example of upslope turbidite deposition in an extremely distal setting. These Eocene-Oligocene beds, which...
View PDF for article title, Upslope deposition of extremely distal turbidites: An example from the <span class="search-highlight">Tiburon</span> Rise, west-central Atlantic
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Journal Article

Comments on the Distribution and Age of High-Grade Blueschists, Associated Eclogites, and Amphibolites from the Tiburon Peninsula, California Available to Purchase

PRISCILLA P DUDLEY
Journal: GSA Bulletin
Published: 01 November 1972
GSA Bulletin (1972) 83 (11): 3497–3500.
DOI: https://doi.org/10.1130/0016-7606(1972)83[3497:COTDAA]2.0.CO;2
View PDF for article title, Comments on the Distribution and Age of High-Grade Blueschists, Associated Eclogites, and Amphibolites from the <span class="search-highlight">Tiburon</span> Peninsula, California
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Image
Interpreted line drawing of seismic section across Tiburon Rise, Tiburon Basin, Barracuda Ridge, and Barracuda Trough (location in Fig. 1). Acoustic basement is in dark gray, and lower of two sedimentary sequences, separated by unconformity (red line) of early Quaternary age, is in light gray. Large and widespread debris flow that overlies main unconformity between two sedimentary sequences is in green.

Interpreted line drawing of seismic section across Tiburon Rise, Tiburon Ba... Available to Purchase

Published: 01 October 2011
Figure 2. Interpreted line drawing of seismic section across Tiburon Rise, Tiburon Basin, Barracuda Ridge, and Barracuda Trough (location in Fig. 1 ). Acoustic basement is in dark gray, and lower of two sedimentary sequences, separated by unconformity (red line) of early Quaternary age
Image
Tectonostratigraphic columns for the Tiburon, Mt Tamalpais and Novato block localities from Figure 2. Locality 12, the Cazadero area, is of uncertain affinity, but is arguably on the Novato Block. The diagram compares columns from this paper with columns based on previous maps. Unit thicknesses are approximations, because in most cases attitude and other structural data are inadequate for exact measurements on the maps for which the columns are constructed. Unit thicknesses of thin units are exaggerated. Because the column thicknesses vary between localities, dashed lines marked ‘Scale Change Line’ serve to separate columns based on different scales. It should be noted that for most localities studied for this paper and for those based on the newer works cited, the amount of mélange is far less than was previously mapped (as ‘Central Terrane Mélange’) by previous workers. Source: previous maps are from Blake et al. (2000, 2002) and other indicated workers.

Tectonostratigraphic columns for the Tiburon, Mt Tamalpais and Novato block... Available to Purchase

Published: 11 September 2024
Fig. 3. Tectonostratigraphic columns for the Tiburon, Mt Tamalpais and Novato block localities from Figure 2 . Locality 12, the Cazadero area, is of uncertain affinity, but is arguably on the Novato Block. The diagram compares columns from this paper with columns based on previous maps. Unit
Image
Comparative maps of part of the Ring Mountain–Tiburon Peninsula area (Location 1 of Fig. 2). (a) Reconnaissance map showing large areas mapped as mélange and the distribution of rock masses thought to be exotic blocks in the mélanges. (b) Detailed map. Scale in (b) applies to both (a) and (b). Source: (a) map from Blake et al. (2000); credit: US Geological Survey Department of the Interior/USGS. (b) Map from Bero (2014) with some modifications based on Wakabayashi (2015, fig. 12) and Ha et al. (2018). It should be noted that many rock exposures mapped by Blake et al. (2000) as mélange blocks are revealed by detailed mapping to be landslide blocks or exposures of in situ units of the Tiburon Ridge Terrane of Bero (2014). Also, in the northwestern part of the map, Blake et al. (2000) ploted one high-grade block, whereas nearly two dozen such blocks exist as shown by Bero (2014), Wakabayashi (2015) and Ha et al. (2018).

Comparative maps of part of the Ring Mountain–Tiburon Peninsula area (Locat... Available to Purchase

Published: 11 September 2024
Fig. 4. Comparative maps of part of the Ring Mountain–Tiburon Peninsula area (Location 1 of Fig. 2 ). ( a ) Reconnaissance map showing large areas mapped as mélange and the distribution of rock masses thought to be exotic blocks in the mélanges. ( b ) Detailed map. Scale in ( b ) applies to both
Journal Article

Why Do Great Continental Transform Earthquakes Nucleate on Branch Faults? Available to Purchase

Ross S. Stein, Peter Bird
Published: 25 September 2024
Seismological Research Letters (2024) 95 (6): 3406–3415.
DOI: https://doi.org/10.1785/0220240175
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Journal Article

Majority of Ruptures in Large Continental Strike‐Slip Earthquakes Are Unilateral: Permissive Evidence for Hybrid Brittle‐to‐Dynamic Ruptures Available to Purchase

Peter Bird, Ross S. Stein
Published: 21 August 2024
Seismological Research Letters (2024) 95 (6): 3306–3315.
DOI: https://doi.org/10.1785/0220240172
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View PDF for article title, Majority of Ruptures in Large Continental Strike‐Slip Earthquakes Are Unilateral: Permissive Evidence for Hybrid Brittle‐to‐Dynamic Ruptures
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Journal Article

The Role of Stress Transfer in Rupture Nucleation and Inhibition in the 2023 Kahramanmaraş, Türkiye, Sequence, and a One‐Year Earthquake Forecast Available to Purchase

Shinji Toda, Ross S. Stein
Published: 16 January 2024
Seismological Research Letters (2024) 95 (2A): 596–606.
DOI: https://doi.org/10.1785/0220230252
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View PDF for article title, The Role of Stress Transfer in Rupture Nucleation and Inhibition in the 2023 Kahramanmaraş, Türkiye, Sequence, and a One‐Year Earthquake Forecast
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Image
Breccia units observed at base of southwestern Isla Tiburón (SWIT) marine basin. (A) Distinctive landslide breccia (Tbx) in sharp contact above unnamed airfall tuffs (Ttua) (see text). Hammer for scale. Photograph from Neuhaus (1989). (B) Typical outcrop texture of distinctive landslide breccia deposit (Tbx). Eutaxitic foliation of flattened pumice fiamme is visible in large breccia clasts, similar to intact source outcrops of the tuff of Ensenada Blanca (Tteb). Hammer handle width is ∼3.5 cm. (C) Typical outcrop of polylithologic sedimentary breccia (Tbxs) that discontinuously underlies marine deposits in arroyos 1 and 4. Photograph taken in the upper reaches of arroyo 4. Hammer is 38 cm long. Photograph is from Keogh (2010).

Breccia units observed at base of southwestern Isla Tiburón (SWIT) marine b... Open Access

Published: 01 August 2015
Figure 8. Breccia units observed at base of southwestern Isla Tiburón (SWIT) marine basin. (A) Distinctive landslide breccia (Tbx) in sharp contact above unnamed airfall tuffs (Ttua) (see text). Hammer for scale. Photograph from Neuhaus (1989) . (B) Typical outcrop texture of distinctive
Image
Geologic map of southwest Isla Tiburón (SWIT; scale 1:5,000; UTM—Universal Transverse Mercator, WGS84—World Geodetic System 1984). New and previously published geochronologic sample locations and isotopic ages shown. SS—sandstone; congl.—conglomerate; approx.—approximately; To download the large-format map plate, please visit http://dx.doi.org/10.1130/GES01153.S2 or the full-text article on www.gsapubs.org. Printed map sheet is 36″ tall, 48″ wide (∼91 cm × 122 cm).

Geologic map of southwest Isla Tiburón (SWIT; scale 1:5,000; UTM—Universal ... Open Access

Published: 01 August 2015
Figure 2. Geologic map of southwest Isla Tiburón (SWIT; scale 1:5,000; UTM—Universal Transverse Mercator, WGS84—World Geodetic System 1984). New and previously published geochronologic sample locations and isotopic ages shown. SS—sandstone; congl.—conglomerate; approx.—approximately; To download
Image
Field photographs of upper conglomerate (Tcmu) on southwest Isla Tiburón. Hammer for scale in B and C is 38 cm long. (A) An inverse graded Tcmu conglomerate bed on the western bank of arroyo 4. Bed inclination is primary depositional dip. (B) Inclined Tcmu conglomerate beds on the western bank of arroyo 4 containing multiple trace fossils. Black rectangle shows enlargement in C. (C) Enlargement of rectangle area in B showing multiple burrows in Tcmu sandy conglomerate bed. Subvertical burrows (black arrows) are oriented orthogonal to modern-day horizontal, not orthogonal to bedding. This supports that the ∼25° inclination in Tcmu beds is due to primary depositional dip, and not tectonic tilting. (D) Panoramic view of Tcnm (nonmarine conglomerate and sandstone deposits) and Tcmu outcrops in arroyo 4. Looking west at exposure where subhorizontal, nonmarine topset beds (Tcnm) laterally grade into inclined, marine foreset beds (Tcmu). Circled person for scale. (E) Annotated interpretation of panorama in D.

Field photographs of upper conglomerate (Tcmu) on southwest Isla Tiburón. H... Open Access

Published: 01 August 2015
Figure 11. Field photographs of upper conglomerate (Tcmu) on southwest Isla Tiburón. Hammer for scale in B and C is 38 cm long. (A) An inverse graded Tcmu conglomerate bed on the western bank of arroyo 4. Bed inclination is primary depositional dip. (B) Inclined Tcmu conglomerate beds
Image
(A–D) Geologic cross sections for southwest Isla Tiburón. Map unit colors and other symbols as in Figure 2. S.L.—sea level. Units shaded lighter are above the ground surface. Dip values from structural measurements used to construct cross sections are shown near ground surface. Apparent dip values are in parentheses. Horizontal scale arbitrarily begins at 0 m at left edge of each cross section. See geologic map (Fig. 2) for cross-section line locations. To view the large-format map plate, please visit http://dx.doi.org/10.1130/GES01153.S6 or the full-text article on www.gsapubs.org. Printed cross-section sheet is 19″ tall, 19″ wide (∼48 × 48 cm).

(A–D) Geologic cross sections for southwest Isla Tiburón. Map unit colors a... Open Access

Published: 01 August 2015
Figure 14. (A–D) Geologic cross sections for southwest Isla Tiburón. Map unit colors and other symbols as in Figure 2 . S.L.—sea level. Units shaded lighter are above the ground surface. Dip values from structural measurements used to construct cross sections are shown near ground surface
Image
Field photographs of marine deposits on southwest Isla Tiburón. Hammer in each photo is 38 cm long (12.5-cm-wide hammer head). (A) Moderately to well-stratified lower conglomerate (Tcml) outcrops along coastline, northwest of Hast Pitzcal. (B) Well-stratified lower conglomerate (Tcml) outcrops in the cove (Fig. 9). (C) Fossiliferous lower conglomerate (Tcml) outcrops on the western flank of Hast Pitzcal. Black rectangle shows enlargement in F. (D) Poorly stratified lower conglomerate (Tcml) outcrops on the western bank of arroyo 2. Clast composition is dominated by locally derived arc-related volcanic rocks with occasional clasts of the distinctive landslide breccia deposit (Tbx). (E) Boulder in lower conglomerate (Tcml) encrusted with possible remnants of late Miocene barnacles. (F) Enlargement of rectangle area in C showing a pair of oyster fossils. (G) Outcrop of tuffaceous marine sandstone (Tsmt) deposits on the eastern bank of arroyo 2. Lower massive bed contains occasional layers of conglomerate stringers and marine fossils. Upper, well-stratified part contains fossiliferous sandstone and sandy conglomerate beds. (Hammer is circled.) (H) Large late Miocene gastropod fossil in Tsmt conglomerate bed. (I) Subvertical burrow (arrows) in tectonically inclined Tsmt sandstone and conglomerate beds.

Field photographs of marine deposits on southwest Isla Tiburón. Hammer in e... Open Access

Published: 01 August 2015
Figure 10. Field photographs of marine deposits on southwest Isla Tiburón. Hammer in each photo is 38 cm long (12.5-cm-wide hammer head). (A) Moderately to well-stratified lower conglomerate (Tcml) outcrops along coastline, northwest of Hast Pitzcal. (B) Well-stratified lower conglomerate (Tcml
Image
Figure 2. Outcrop and sample photographs from ROV Tiburon dives. A: Dive T280, 1770 m, fractured pillows. B: Dive T289, 3324 m, slabby, indurated hyaloclastite beds on outer block. C: Dive T289, 2310 m, fine-grained turbidite unit, grading from laminated siltstone to bioturbated mudstone. D: Dive T281, 2443 m, cohesive, bedded volcaniclastic breccia. E: Dive T281, 2915 m, ridge of intensely sheared volcanic rock. F: Dive T290, 2496 m at top of dive, coherent, glassy pillow basalt flows.

Figure 2. Outcrop and sample photographs from ROV Tiburon dives. A: Dive ... Available to Purchase

Published: 01 May 2003
Figure 2. Outcrop and sample photographs from ROV Tiburon dives. A: Dive T280, 1770 m, fractured pillows. B: Dive T289, 3324 m, slabby, indurated hyaloclastite beds on outer block. C: Dive T289, 2310 m, fine-grained turbidite unit, grading from laminated siltstone to bioturbated mudstone. D: Dive
Image
Figure 3. Photomicrographs of samples recovered during ROV Tiburon dives. Widths of images represent ∼3 mm; images were taken in plane-polarized light (except D). A: Dive T289, 2310 m, polymict siltstone from fine-grained turbidite unit; bedding is vertical. B: Dive T289, 3325 m, polymict, volcaniclastic siltstone, with abundant glassy grains. C: Dive T289, 3088 m, fine-grained, indurated hyaloclastite, cemented by interstitial zeolites; clasts are partially altered to palagonite and rimmed by clay. Image width is ∼1 mm. D: Dive T289, 3002 m, chlorite filling of vesicle (top) and pseudomorph after olivine (center) in basalt clast collected from coarse, polymict breccia. Cross-polarized light. E: Dive T281, 3080 m, cataclastic texture in fine-grained, vesicular basalt. F: Dive T281, 2492 m, multiple slip surfaces and planar fabric within volcanic clast in pervasively sheared, foliated cataclasite.

Figure 3. Photomicrographs of samples recovered during ROV Tiburon dives.... Available to Purchase

Published: 01 May 2003
Figure 3. Photomicrographs of samples recovered during ROV Tiburon dives. Widths of images represent ∼3 mm; images were taken in plane-polarized light (except D). A: Dive T289, 2310 m, polymict siltstone from fine-grained turbidite unit; bedding is vertical. B: Dive T289, 3325 m, polymict
Image
—Geologic map of northern part of Tiburon Peninsula, showing relation of schist bodies to serpentine.

—Geologic map of northern part of Tiburon Peninsula, showing relation of sc... Available to Purchase

Published: 01 February 1943
Fig. 4. —Geologic map of northern part of Tiburon Peninsula, showing relation of schist bodies to serpentine.
Image
—Cross sections, northern part of Tiburon Peninsula, showing relation of schist bodies to serpentine.

—Cross sections, northern part of Tiburon Peninsula, showing relation of sc... Available to Purchase

Published: 01 February 1943
Fig. 5. —Cross sections, northern part of Tiburon Peninsula, showing relation of schist bodies to serpentine.
Book Chapter

Identification and Evaluation of Molecular Bioindicators of Natural Hydrocarbon Seepage in Gulf of Mexico Sediments Available to Purchase

Author(s)
Matthew Ashby, Sa Vanna Baker Leyva, Kimberley Cook, Patrick Mulroy, Karen Nelson, Michael A. Abrams, Dago Dimster-Denk
Book: Hydrocarbon Seepage: From Source to Surface
Publisher: Society of Exploration Geophysicists
Published: 01 January 2013
DOI: 10.1190/1.9781560803119.ch8
EISBN: 9781560803119
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Abstract Microbial communities inhabiting prolific hydrocarbon seeps in the Gulf of Mexico have been characterized by culture-independent DNA profiling of 16S ribosomal RNA (rRNA) genes. High-throughput 454 pyrosequencing was combined with serial analysis of ribosomal DNA (SARD) to vastly increase the number and, hence, sensitivity and accuracy of microbial 16S rRNA gene detection. This approach enabled the detection of more than 5 million ribosomal sequence tags and revealed that approximately one-third of the sequence tags showed a similar distribution among the sediment piston-core samples compared to the major hydrocarbon constituents present in the seeps. Numerous correlated distributions or associations were found between particular microbial DNA sequences and specific hydrocarbons, suggesting a biochemical role in the transformation of these compounds. Quantitative polymerase chain reaction (qPCR) primers were designed to target these 16S rRNA gene sequences and were found to accurately detect and serve as sensitive bioindicators for these hydrocarbons in blind tests. The results underscore the need for a thorough characterization of geochemistry and microbiology to fully understand the dynamics of these biogeochemical associations.

Journal Article

High-resolution velocity notch filter without Gibbs effect Available to Purchase

Eugene Lichman, E. John Northwood
Journal: Geophysics
Published: 01 February 1997
Geophysics (1997) 62 (1): 274–287.
DOI: https://doi.org/10.1190/1.1444128
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