Bedrock context · Macrostrat

diabase

Light- to dark-gray and dark-greenish-gray, chiefly medium-crystalline and porphyritic, but finely crystalline and aphanitic near chilled margins and in narrow dikes. Deeply weathered to orange-brown saprolite more than 6 m (20 ft) thick on uplands. Diabase of at least three principal magma types: 1) in places aphanitic diabase (Jdqh) encloses light- and dark-gray, layered, orthopyroxene-rich cumulate plugs and sheets; elsewhere encloses sheets containing light- and medium-gray, medium- to coarse-crystalline ferrogabbro, ferrodiorite, and pegmatoid, pinkish-gray to dark pink porphyritic granophyre and syenite, and finely crystalline aplite. Both types of diabase are magmatic derivatives of high TiO2, quartz-normative tholeiite (HTQ); unit Jdqh is mainly an interlocking crystalline mosaic of calcic plagioclase and pyroxene, and unit Jdqhg is a predominantly late-stage granophyric differentiates with sodic plagioclase, K-spar, quartz, hornblende, biotite and pyroxene. Differentiated sheets locally exceed 600 m (2000 ft) in thickness and dikes vary from a wedge-edge to 150 m (500 ft) wide. 2) Diabase of low titanium (LTQ) magma type (Jdql on map), characterized by centimeter-sized clusters of calcic plagioclase phenocrysts, occurs as chemically uniform, moderately thick (more than 215 m (700 ft) sill-like sheets and as narrow dikes that locally swell to more than 150 m (500 ft) wide. 3) Diabase of the olivine-normative magma type (Jdo on map), as dikes and plugs within the basin and as dikes in the Blue Ridge. In addition to subequal amounts of calcic plagioclase and augite, contains abundant olivine, locally altered to serpentine, with minor granules of magnetite, chromite, and ilmenite; locally picritic. Diabase dikes with magma type not determined shown as Jd on map. A whole-rock sample from unaltered diabase has yielded a nearly concordant 40Ar/39Ar age spectrum with a well-defined plateau age of 201.2+1.3 Ma (Sutter, 1988). This Early Jurassic age is interpreted to be a close approximation to the time of igneous intrusion, differentiation, and crystallization of the Centreville HTQ sheet and related diabase (Sutter, 1988). Another whole-rock sample from fresh LTQ diabase yielded a nearly concordant 40Ar/39Ar age spectrum with a fairly well-defined plateau age of 199.3+3.0 Ma for the Catlett sheet (Sutter, 1985). These age estimates are analytically indistinguishable, so at least to the temporal resolution possible by the 40Ar/39Ar technique, HTQ and LTQ diabase in the Culpeper basin are coeval.

Groundwater context · USGS NWIS

Your parcel sits inside this principal-aquifer footprint· show map ↓

Source: USGS Principal Aquifers

Water-demand context · Google Maps + News (Perplexity) + OpenStreetMap · USGS

249 data centers within 25 mi

⚠ Same aquifer as your parcel

Coverage may be incomplete — some private, unmarked, or recently-built facilities may not appear.

News-sourced records are aggregated from public reporting (citations linked per record). GeoLocity does not independently verify project status or operator claims. Coverage of announced or recently-broken-ground facilities depends on public news availability.

Future iterations may add: cooling-method classification per facility, permitted-but-not-yet-built data centers via state environmental permit databases, and per-facility water-withdrawal volumes where operators voluntarily disclose.

Sources: USGS Water Use Data · OpenStreetMap (ODbL) · Google Maps Places · Perplexity sonar-pro

Environmental context · EPA

Environmental records within ~10 mi

Most are routine regulatory registrations — not evidence of contamination