...L. L. Corbitt; F. L. Nials; R. J. Varnell Abstract The Brockman Hills of southwestern New Mexico consist primarily of strongly folded quartzite and shale of the Lower Cretaceous Mojado Formation, and are a key part of the Laramide Cordilleran foldbelt. Folds trend west-northwest and are overturned...

...Fig. 8 —Structure section through eastern Brockman Hills showing overturned folds in Lower Cretaceous beds ( Kl ). ...

... successions overlying the Pilbara Supergroup. CF - Cardinal Formation; PMF - Paddy Market Formation; PHF - Pyramid Hill Formation; NIF - Nimingarra IF; CvF - Cleaverville Formation. Formations described in the text in bold. (C) Stratigraphy of the 2.60–2.45 Ga Hamersley Group. Figure 3. Chert...

... of displacement on the major overthrust. West-northwest-trending folds in Lower Cretaceous rocks in the Brockman Hills are overturned toward the northeast and are broken by thrust faults that have brought Cretaceous onto Permian-Pennsylvanian strata ( Corbitt et al, 1977 ). The Paleozoic units in turn have...

...S. R. Brockman; G. A. Bollinger Abstract This study develops estimates for the attenuation of peak vertical ground motions using a conventional, least-squares regression model applied to unfiltered and bandpass-filtered ground-motion data. The input data are from 88 earthquakes (1.0 ≤ M ≤ 3.3...

... iron-formation occurs in an amphibolite- to granulite-grade Paleoproterozoic metasedimentary succession (Willyama Supergroup) at Broken Hill, New South Wales, Australia ( Stanton 1976a , 1976b , Stevens et al. 1983 ). There, apatite-bearing “banded iron-formation” consists almost entirely...

..., frameworks for the earliest Proterozoic as also reconstructed for parts of the Mesozoic and Paleozoic. The Kuruman Iron Formation (IF) (Griqualand West Basin, South Africa) and Dales Gorge Member of the Brockman IF (Hamersley Basin, Western Australia) are of special interest in this regard, given...

... up the valley of Clear Creek and down Brockman Creek. Little Elk Mountain is just north of Clear Creek, on the south flank of Big Elk Mountain. It also has an anticlinal structure, with steep-dipping Jurassic and Lower Cretaceous formations on the southwest flank. The valley of Brockman Creek...

..., and are distributed in unpredictable manners ( Brockman and Murray, 1997 ; Hersman, 1997 ). It is thought that water availability and its effect on nutrient bioavailability (including C) control microbial activities in the vadose zone of semiarid regions ( Brockman et al., 1992 ; Fredrickson et al., 1993 ; Holden...

... , and 0.015% Ta 2 O 5 ). Importantly, abundances of HREE and HREE/LREE ratios for samples from Pennington Mountain are higher than those of carbonatite-hosted deposits and the Dubbo (Toongi) deposit, and are similar to those of the Bokan Mountain deposit ( Fig. 8 ). The unmined Brockman REE-Nb-Zr deposit...

... of tholeiite flood basalts and komatiites (e.g., Kambalda: Gresham and Loftus-Hills, 1981 ); (2) convergent margins where komatiites are associated with arc-type volcanism ( Dostal and Mueller, 1997 ; Hollings and Wyman, 1999 ; Hollings et al., 1999 ; Rosengren et al., 2008 ); and (3) submerged continental...

.... New evidence indicates that the orebodies are structurally controlled along old normal fault systems that formed during a period of major uplift and extension in Proterozoic times. Hematite ores are always hosted by the Brockman Iron Formation, and ore formation resulted from a multistage, sequential...

... (MMI; Brockman et al., 1988 ) and epicenter ( Bondár et al., 2015 ). Colored dots—slip rate sites for M06 ( Matmon et al., 2006 ), M09 ( Mériaux et al., 2009 ), and H17 ( Haeussler et al., 2017 ). PAC—Pacific plate; AK—Alaska; CA—Canada. (B) Denali fault landform offset-age data, origin (black dot...

.... (1972) . Displacements on the Imperial, Superstition Hills, and San Andreas faults triggered by the Borrego Mountain earthquake , in The Borrego Mountain Earthquake of April 9, 1968 , U.S. Geol. Surv. Profess. Pap. 787 , 87 - 104 . Benioff H...