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astronomical alignment

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Journal Article
Journal: GSA Bulletin
Published: 01 March 2019
GSA Bulletin (2019) 131 (9-10): 1702-1722.
... a floating astronomical time scale (ATS) for the study interval. Stable eccentricity cycles (405 k.y.) align with stratigraphic sequences and associated trends in sedimentation rate, and short eccentricity cycles (∼100 k.y.) pace nested parasequences. These results confirm an astronomical signal...
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Journal Article
Journal: Geology
Published: 12 December 2018
Geology (2018) 47 (1): 83-86.
... stratotype section and point (GSSP) candidates for the Carboniferous Period. High-resolution magnetic susceptibility measurements through the section have variations that correlate with lithological cycles of lime mudstone, wackestone, and packstone. Astronomical calibration of ∼3 m sedimentary cycles...
FIGURES
Journal Article
Published: 01 March 2014
Journal of the Geological Society (2014) 171 (2): 255-268.
... as typified by the Mangan transect with fabrics detailed in Figure 3 . There is a strong north–south stretching lineation identified from boudinage structures ( Fig. 3a ), stretching fabrics in L-tectonites ( Fig. 3b ), aligned fold axes, and mineral lineations ( Fig. 3d ). Extensive shearing has formed...
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Journal Article
Published: 01 July 2015
Journal of the Geological Society (2015) 172 (4): 491-498.
.... Comparison of bulk organic matter δ 13 C from three hyperthermal events. The complete record for each CIE was scaled proportionally, giving a common alignment of the inception and termination of the CIEs. There is evident similarity between the Toarcian CIE, Yorkshire, UK ( Kemp et al. 2005 ) and the early...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP414.3
EISBN: 9781862397156
... outcrops in the Givet area for a possible astronomical imprint, to fully understand the rates of evolutionary and environmental change. All four sections are firmly correlated and wavelet analyses of the magnetic susceptibility signals reveal the imprint of astronomical eccentricity forcing. The highly...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2013
GSA Bulletin (2013) 125 (11-12): 1703-1734.
... astronomical (“Milankovitch”) forcing of insolation and the paleoclimate system. Fossil astronomical signals are collected from cyclic sedimentary sequences by detailed sampling and study of facies, geochemistry, mineralogy, rock magnetism, color, etc. In step with the documentation of astronomically forced...
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Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP280.8
EISBN: 9781862395282
... cores in the Dandong Granites near the Liaonan Neoarchaean terrane. This partial melting is probably related to in situ remelting of ancient lower continental material, mostly the North China Craton. The Dandong plutons are aligned in a NE–SW direction and are extensively deformed by subhorizontal...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2018
GSA Bulletin (2018) 131 (3-4): 499-520.
... Rossa and Variegata Formations of the Umbria-Marche Basin (central Italy). Geochemical and magnetostratigraphic alignment between the Bottaccione section (Gubbio, central Italy) and the Smirra core (Cagli, central Italy) allows us to generate a continuous and well-preserved new record that, combined...
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Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP381.8
EISBN: 9781862396401
... sensitivity over part of the infrasound frequency range. The array alignment of the infrasound stations, moreover, could firmly provide robust information about the arrival direction and epicentral distance from the infrasound sources. Additional observations with an array station near the current SYO station...
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Journal Article
Journal: Geology
Published: 22 March 2019
Geology (2019) 47 (5): 457-460.
...Carling C. Hay; Jessica R. Creveling; Cedric J. Hagen; Adam C. Maloof; Peter Huybers Abstract The visual alignment of chemostratigraphic excursions enables correlation of sedimentary successions within the bounds of geochronology or biostratigraphy. This correlation facilitates the extrapolation...
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Series: AAPG Memoir
Published: 01 January 2012
DOI: 10.1306/13291386M95385
EISBN: 9781629810096
...-imentology were combined with well-log interpretations from the offshore Azeri-Chirag-Deep Water Guneshli oil field to quantify the nested nature of depositional cycles inferred to represent 20 ka, 100 ka, and 400 ka astronomically driven climate cycles. Spectral analysis of gamma-ray logs supports...
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Series: SEPM Special Publication
Published: 01 January 2004
DOI: 10.2110/pec.04.81.0167
EISBN: 9781565762176
... recorded the clearest orbital forcing signal yet found in a carbonate platform. This astronomical calibration indicates that the section was deposited in ca. 3.1 My and therefore that the entire Latemar cyclic succession (~470 m) took at least 9 My to form. However, the calibration also leads to serious...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP404.12
EISBN: 9781862396807
.... The authenticity of Milankovitch cycles in the stratigraphic record is substantiated by climate modelling, in both transient experiments and time-snapshot experiments for astronomical extremes, although much work still needs to be done to explain Milankovitch variability in stratigraphy (e.g. the Mid-Pleistocene...
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Journal Article
Journal: Geology
Published: 01 January 2000
Geology (2000) 28 (1): 67-70.
...W. E. Holt Abstract Vertical to subvertical planes of shear within the active crustal deformation field in Tibet align with fast directions of shear-wave polarization. This observation suggests that the present-day velocity gradient tensor field within the crust of Tibet correlates...
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Journal Article
Published: 01 December 1990
Journal of the Geological Society (1990) 147 (6): 971-978.
... preferentially aligned by the prevailing stress-field. This phenomenon is known as extensive-dilatancy anisotropy or EDA, and the fluid-filled microstructures as EDA-cracks because the seismic effects can be modelled by distributions of parallel cracks. The effects of these stress-aligned EDA-cracks have been...
Journal Article
Journal: Geology
Published: 01 May 2005
Geology (2005) 33 (5): 409-412.
... in the fact that these variations are found at a locality with few lineaments or fissures at seafloor level. The overlap region between mid-ocean ridge segments at 9°N on the East Pacific Rise is characterized by aligned cracks that are structurally more closely related to the propagating-ridge segment...
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Journal Article
Published: 17 December 2018
Geological Magazine (2018) 156 (9): 1469-1509.
... at all sites. The frequency ratios between the different scales of cyclicity are consistent with astronomical forcing of climate at the periods of the short eccentricity, obliquity and precession cycles. Using local tuned time scales, 62 ammonite biohorizons have minimum durations of 0.7 to 276 ka...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP450.9
EISBN: 9781786203311
... of the Asselian and earliest Sakmarian, and this forms the basis for a new astronomical tuning of the mid-continent USA biostratigraphic succession with the Uralian geochronological age interpolations ( Fig. 2 ). Tuning to 10 cycles results in the alignment of Streptognathodus species, as well as the timing...
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Journal Article
Journal: Geology
Published: 01 March 2011
Geology (2011) 39 (3): 227-230.
... new chronological tool for estimating ages and growth rates for hydrogenetic ferromanganese crusts. It provides chronological constraints with the accuracy promised by the astronomically calibrated magnetostratigraphic time scale (1–40 k.y.). 26 7 2010 30 9 2010 6 10 2010 © 2011...
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Journal Article
Journal: AAPG Bulletin
Published: 01 December 1927
AAPG Bulletin (1927) 11 (12): 1253-1281.
... of the area. Astronomical observations were made as a check on the plane-table traverse, which was carried over all routes of travel. Collections of fossils, mostly from the vicinity of Napo, establish one horizon of Turonian (Eagle Ford-Benton) age, and a second of middle Albian (mid-Comanchean) age...
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