Gravity Anomaly Map of North America

Tanner, J G; Aiken, Carlos L. V.; Dehlinger, Peter; Dewhurst, W. T.; Fuente, Mauricio de la; Godley, Valerie M.; Godson, Richard H.; Hanna, W. F.; Hildenbrand, Thomas G.; Kleinkopf, M.D.; McCalpin, George A.; McConnell, R K; Meyers, H.; O'Hara, Norbert W.; Palmer, Allison R.; Scheibe, Donald M.; Sweeney, Ronald E.; Thorning, L

doi:10.1190/1.1439456

Cited by 20 publications

(10 citation statements)

References 117 publications

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“…6). This same pattern is observed in the regional Bouguer anomaly in the northern portion of the central trans-Mexican Volcanic Belt (Tanner et al, 1988;De la Fuente et al, 1991). Figure 7 shows the location and distribution of the gravity observations in our study area, and includes gravity measurements made by Ballina (1982) in areas of the Huichapan caldera and the Pathé geothermal field.…”

Section: Shallow Structure Inferred From Gravitysupporting

confidence: 68%

Contribution to the tectonics of the northern portion of the central sector of the trans-Mexican Volcanic Belt

Campos-Enríquez¹,

Rodríguez²,

Delgado‐Rodríguez³

et al. 2000

Cenozoic Tectonics and Volcanism of Mexico

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Gravity data from the central sector of the trans-Mexican Volcanic Belt indi-cate that the area bounded on the east by the Mezquital valley (99° W), on the west by the Queretaro fault zone (100.5° W), and to the north by the Sierra Madre Oriental fold and thrust belt (20.6° N) consists of an east-west-oriented basement depression. The eastern part of this depression is a single 50-70-km-wide (northsouth) basin. To the west, it narrows and consists of several smaller basins separated by tilted fault blocks that become progressively more pronounced westward. Presumably, the block faulting is related to an older (Cenozoic) extensional event because no surface deformation is associated with these faults. Contrary to previous studies, the gravity data indicate that the Pastores fault (which forms the southern boundary of the Acambay graben) terminates at 99.3° W and does not continue eastward to the Mezquital valley, as previously proposed. The fault pattern inferred from the gravity data, as well as earthquake data, is consistent both with a recent and an older phase of north-south-directed extensional tectonics of intraplate origin (intra-arc extension).

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Section: Shallow Structure Inferred From Gravitysupporting

confidence: 68%

Contribution to the tectonics of the northern portion of the central sector of the trans-Mexican Volcanic Belt

Campos-Enríquez¹,

Rodríguez²,

Delgado‐Rodríguez³

et al. 2000

Cenozoic Tectonics and Volcanism of Mexico

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“…(a) The Bouguer gravity anomaly of North America from the Decade of North American Geology 6‐km spacing gravity grid (Tanner et al, ). The study region is shown by the box.…”

Section: Introductionmentioning

confidence: 99%

P Wave Teleseismic Traveltime Tomography of the North American Midcontinent

et al. 2019

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The remains of the 1.1‐Ga Midcontinent Rift (MCR) lie in the middle of the tectonically stable portion of North America. Previous and ongoing studies have imaged strong heterogeneity associated with the MCR in the crust but have not imaged such within the mantle. It is unclear whether this is due to the absence of rift‐related mantle structures or these studies had insufficient resolution to image them. To address this issue, we measured 46,374 teleseismic P wave delay times from seismograms recorded by the USArray Transportable Array, Superior Province Rifting EarthScope Experiment, and surrounding permanent stations. We included these and 54,866 delay times from prior studies in our tomographic inversion. We find that high‐velocity anomalies are widespread in our study area, but there are also prominent low‐velocity anomalies. Two of these are coincident with high‐Bouguer gravity anomalies associated with the MCR in Iowa and the Minnesota/Wisconsin border at 50‐ to 150‐km depth. Extensive resolution testing shows that these anomalies could be the result of downward vertical smearing of relatively low velocities from rift‐related material that “underplated" the crust, although we cannot exclude that the subcrustal mantle lithosphere beneath the MCR is anomalously enriched, hydrated, or warm. Other anomalies occur at syntaxes of the Penokean Orogen. One with the Superior Province and Marshfield Terrane in southern Minnesota and another with the Yavapai and Mazatzal Terranes, both at 100‐ to 250‐km depth. In the midmantle, we image two linear high‐velocity anomalies, interpreted as subducted fragments of the Farallon and Kula plates.

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“…7. In the regional gravity maps of southern Mexico (i.e., Mena et al, 1995;Tanner et al, 1988) the study area is featured by NNW-SSE linear gravity contours with a NE-SW gravity gradient towards the continent (coinciding in direction with those of our detailed gravity study). The regional character of these features enabled us to assume that the regional anomaly in our study area could be modeled by a plane (a first order polynomial) which was adjusted using a least squares method (Fig.…”

Section: Gravity and Magnetic Datamentioning

confidence: 98%