Maryann Love Malinconico

Lafayette College · Geology and Environmental Geosciences

Graptolite (GRo) and vitrinite (VRo) reflectance (Malinconico, 1992, 1993, unpub. data) with previously published conodont alteration indices (CAI) is used to detail very-low-grade metamorphic trends in the analcime-prehnite-pumpellyite (PPA) grade (Richter and Roy, 1976) Ordovician-Lower Devonian rocks of the Aroostook-Matapedia (AM) belt in north...

We have analyzed and synthesized geologic and geophysical data from the onshore Newark rift basin and adjacent onshore and offshore basins to better understand the Mesozoic development of the eastern North American rift system and passive margin. Our work indicates that rifting had three phases: (1) an initial, prolonged phase of extension and subs...

Eastern North America (ENAM) is a natural laboratory for studying the development of passive margins. It hosts one of the world’s largest rift systems (the eastern North American rift system), one of the world’s oldest intact passive margins, and one of the world’s largest igneous provinces (the Central Atlantic Magmatic Province, CAMP). Additional...

In the southern Virginia Piedmont, Upper Triassic lacustrine rocks in the Dan River Basin (DRB) occupy the hanging wall and high-grade metamorphic rocks compose the footwall of the NE-striking, SE-dipping, rift-bounding Chatham normal fault. Rock cores obtained during uranium exploration near Chatham, Va., yield key data that bear on the geometry o...

A new system for the microscopic classification of fly-ash components has been developed by the Fly-Ash Working Group, Commission III of the ICCP and is presented herein. The studied fly-ashes were obtained from the combustion of single coals of varied rank, coal blends, and coals blended with other fuels (biomass, petroleum coke), in different ope...

On many passive margins, an episode of uplift, not predicted by simple lithospheric stretching, developed during the transition from rifting to drifting. The resultant unconformity, termed the breakup or post-rift unconformity, separates the syn-rift and post-rift strata. Likely causes include asthenospheric upwelling, magmatic underplating, phase...

Many of the world’s prospective hydrocarbon basins have undergone significant exhumation after their formation. Exhumation can significantly alter the petroleum potential of these basins by influencing the timing of source-rock maturation and hydrocarbon migration, by modifying reservoir quality, and by altering the integrity of hydrocarbon traps....

The Late Triassic Taylorsville basin is an onshore continental rift basin along the US Central Atlantic margin. The basin is one member of the early Mesozoic North American rift basin system that trends north–south from the southern US into maritime Canada and has formed within a wide rift zone between Early Triassic collapse of the Appalachian oro...

The Late Triassic Taylorsville basin is an onshore continental rift basin along the US Central Atlantic margin. The basin is one member of the early Mesozoic North American rift basin system that trends north–south from the southern US into maritime Canada and has formed within a wide rift zone between Early Triassic collapse of the Appalachian oro...

We use seismic, field, core, borehole and vitrinite-reflectance data to constrain the development of the Newark Rift Basin, one of the largest and most thoroughly studied basins of the eastern North American rift system that formed during the break-up of Pangaea. These data provide critical information about the geometry of the preserved synrift se...

The age of the trondhjemite gneiss with amphibolite xenoliths in the core of this northeast-trending asymmetric dome was confirmed last year as late Ordovician (SHRIMP zircon age 454 + 7 Ma; Malinconico and others, 2011), after several decades of various interpretations as the Ordovician core of a dome or Siluro-Devonian volcanics. Mantling cumming...

The recent vitrinite reflectance study of the Chesapeake Bay impact structure (CBIS), Virginia, highlighted the dearth of U.S. Atlantic Coastal Plain maturity data available for background thermal framework studies, despite numerous deep exploration wells drilled from 1944 to the 1970’s. For that study, comparative background maturities were calcul...

The pattern of synrift to early postrift steady-state and transient basin-scale groundwater flow in the Newark basin is evident in its paleomaximum temperature structure, recorded in surface and borehole vitrinite-reflectance data. Flow in the Late Triassic to Early Jurassic occurred primarily through coarse porous clastic sedimentary units and alo...

Vitrinite reflectance data from the International Continental Scientific Drilling Program (ICDP)-U.S. Geological Survey (USGS) Eyreville deep cores in the centralcrater moat of the Chesapeake Bay impact structure and the Cape Charles test holes on the central uplift show patterns of postimpact maximum-temperature distribution that result from a com...

During 2005-2006, the International Continental Scientific Drilling Program and the U.S. Geological Survey drilled three continuous core holes into the Chesapeake Bay impact structure to a total depth of 1766.3 m. A collection of supplemental materials that presents a record of the core recovery and measurement data for the Eyreville cores is avail...

Vitrinite reflectance data and heatflow modeling indicate post-impact heating in the Chesapeake Bay impact structure is due primarily to compaction-driven advective flow from suevitic and deeper brines with minor conductive heating from the suevites.

This dissertation, using organic petrology techniques, examines thermal evolution and organic facies among eastern North American early Mesozoic rift basins. It demonstrates geographic variability in 1) both advective heatflow distribution and organic deposition due to latitudinal climatic influence on clastic sediment deposition, hydrostratigraphy...

Vitrinite reflectance on dispersed sedimentary organic matter is traditionally determined from histograms of vitrinite and inertinite reflectance measured on either whole rock samples or kerogen concentrates, or from particles usually in whole rock preparations chosen by morphology and relative reflectance to be first-cycle vitrinite. This paper di...

An assemblage of highly brecciated organic fragments at the contact of the Middle Ordovician Annville and Myerstown Formations in the Lebanon Valley nappe, Lebanon County, Pennsylvania, was found to have maximum reflectances generally exceeding 8%R, with the highest values approaching 13%R. Such reflectance values are consistent with greenschist fa...

The research will test 1) previous thermal history models of the Jurassic-Triassic Newark rift basins, eastern US, and 2) current hydrologic models of advective / conductive heat flow in continental rift basins using vitrinite reflectance. Previous thermal models of the Newark basin include a high thermal pulse / hydrothermal event associated with...

Vitrinite reflectance was measured on plant fossils from the Devonian Mapleton and Trout Valley Formations in northern Maine in order to assess the degree and possible history of thermal maturation of these post-Acadian intermontane basin deposits, generally considered to be unmetamorphosed. The Middle Devonian Mapleton Formation, west of Presque I...

Reflectance crossplot analysis, a graphical technique plotting apparent reflectance maxima and minima against the apparent bireflectance and previously used primarily for interpretation of biaxial vitrinite data, is applied to graptolite reflectance data from the subgreenschist and chlorite zones of northern Maine, U.S.A., to determine the value of...

Reflectance data has been collected on Ordovician-Lower Devonian graptolites from the prehnite-pumpellyite metamorphic region in northeast Aroostook County, Maine, U.S.A., at the northern end of the Appalachian Mountain Belt. The data is reported as the mean maximum reflectance which, crossplots, (maximum and minimum reflectance vs bireflectance) d...

Ansrnacr Howardevansite, NaCu2*Fe3*ffO.)3 , has been discovered in the summit crater fu-maroles of Izalco volcano, El Salvador. The mineral, which occurs with lyonsite and thenardite, formed as a sublimate from the volcanic gases. Howardevansite occurs as euhedral, black tabular crystals up to 80 pm in greatest dimension. The crystals are tri-clini...

Lyonsite, 116Cu32+Fe43+(VO4)63-, a new iron-copper vanadate mineral, has been discovered in the summit crater fumaroles of Izalco volcano, El Salvador. It is found with thenardite and a Na-Cu-Fe vanadate formed as a sublimate product from the volcanic gases, and occurs as euhedral, black lathlike crystals = or <230 mu m in greatest dimension. Lyons...

Silicic Plinian tephra units representing more than 30 Quaternary eruptions blanket Guatemala and El Salvador. They were erupted mainly from 5 principal sources, all of them calderas. Several of the eruptions were accompanied by ash flows. These eruptions also have the most extensive tephra deposits. The total volume of material erupted is equivale...