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Gravity Survey and Geological Interpretation, Northern New York1

1964; Geological Society of America; Volume: 75; Issue: 2 Linguagem: Inglês

10.1130/0016-7606(1964)75[81

1943-2674

Gene Simmons,

Geological and Geochemical Analysis

Research Article| February 01, 1964 Gravity Survey and Geological Interpretation, Northern New York1 GENE SIMMONS GENE SIMMONS Dallas Seismological Observatory, Southern Methodist University, Dallas, Texas Search for other works by this author on: GSW Google Scholar GSA Bulletin (1964) 75 (2): 81–98. https://doi.org/10.1130/0016-7606(1964)75[81:GSAGIN]2.0.CO;2 Article history received: 18 Jan 1963 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation GENE SIMMONS; Gravity Survey and Geological Interpretation, Northern New York. GSA Bulletin 1964;; 75 (2): 81–98. doi: https://doi.org/10.1130/0016-7606(1964)75[81:GSAGIN]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract About 2000 gravity stations were established 3-5 miles apart in the Adirondack Mountains and surrounding area. The data show an excellent correlation with geology: the anorthosite bodies are conspicuously outlined by gravity lows; the Northwest Adirondacks, a belt of Grenville rocks along the St. Lawrence River, is associated with a gravity high; and centered over Tug Hill is a small gravity low. A few of the 23 residual anomalies in the area have no apparent correlation with geology.The residual anomaly limits the possible three dimensional shapes of the anorthosite massif; it cannot be a batholith or a large tilted lens. It is essentially a slab having two roots that extend downward about 10 km. Because the residual anomaly is a gravity low, the anorthosite is less dense than the surrounding rocks. The density of the anorthosite is 2.72 gm/cm3, and the density contrast is −0.10, implying that the average density of the surrounding Precambrian rocks is 2.82.Variations in the regional anomaly are attributable to small warps of the M discontinuity. A north-trending ridge with 2 degree dip 36 km beneath the mountains satisfies the gravity data and conforms with previous seismic work.The regional isostatic anomaly, near zero in the immediate vicinity of the mountains, suggests that the region is near isostatic balance. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.