%0 Conference Proceedings %B Geological Society of America Abstracts with Programs %D 2015 %T The Nashoba Terrane: A new tectonostratigraphy and shared structural styles with the Merrimack belt in Massachusetts %A Joseph P Kopera %K #StaffPubs %K acadian %K alleghenian %K amphibolite facies %K chlorite %K deformation %K eastern Massachusetts %K fabric %K folds %K Harvard Conglomerate %K Hudson %K merrimack %K Merrimack Belt %K nashoba %K Nashoba terrane %K nashua %K Nashua Trough %K pin hill %K Structural geology %K tectonic history %K tectonostratigraphy %X Recent STATEMAP-sponsored geologic mapping of several 7.5' quadrangles in east-central Massachusetts describe a new tectonostratigraphy and structural history for migmatitic gneisses of the Cambro-Ordivician arc complex represented, in part, by the Nashoba Formation. While preserved sedimentary structures are absent, four discrete subunits can be mapped based on distinct lithologies. From structurally lowest to highest, they are: A felsic magnetite-bearing bt gneiss, a magnetite and silliminite rich mu-bearing bt paragneiss, gt-bearing sulfidic bt-gneisses interlayered with sulfidic schist, amphibolite, and marble, and a calc-silicate rich bt-gneiss. The Nashoba terrane exhibits near-identical early and late styles of deformation to those in the adjacent Nashua sub-belt of the Merrimack terrane: Early amphibolite-facies isoclinal folding (D1) overprinted by tight upright folding (D2) and associated thrust faults define the map-scale geometry of tectonostratigraphic units between the two terranes. D2 occurred syn-peak upper amphibolite facies metamorphism in the Nashoba terrane while defined by retrograde greenschist facies fabrics in the Merrimack terrane. These are overprinted by outcrop-scale sinistral strike-slip motion (D3) in the Nashoba terrane progressively transitioning to late chlorite-grade NW-side down oblique extension (D4) exhibited in both terranes. Correlation of the above sequence with existing geochronology, structural petrology, and tectonic studies by other workers in the area suggest that D1 in both terranes occurred prior to and/or during ~370 Ma Acadian orogenesis. Existing geochronology shows D2 fold and fabric development to be diachronous both within and across terranes: occurring both before and after ~363 Ma, with progressive development possibly as late as ~325 Ma, in the Nashoba terrane. D2 in the Nashua sub-belt of the Merrimack terrane occurs after ~330 Ma in the Carboniferous, as late at ~293 Ma in the Permian, during Alleghenian orogenesis. NW-side-down extension and associated rotation of M1 metamorphic isograds in the Merrimack Terrane, and exhumation of the Nashoba terrane, are generally accepted to have occurred during later stages of Alleghenian orogenesis in the Permian. %B Geological Society of America Abstracts with Programs %7 3 %I Geological Society of America (GSA) : Boulder, CO, United States %C Northeastern Section - 50th Annual Meeting (23–25 March 2015), Bretton Woods, NH %V 47 %P 42 %8 03/2015 %G eng %U https://gsa.confex.com/gsa/2015NE/webprogram/Paper253009.html %0 Online Database %D 2005 %T Well inventory of the Hudson quadrangle, Massachusetts %A Fernandez, M. %A Duncan, C. %A Stephen B Mabee %K #MGSPub %K #Subsurface %K #WellInventory %K Berlin %K Bolton %K borings %K Boxborough %K Harvard %K Hudson %K Malborough %K Stow %K water resources %K wells %X

Well Inventories consist of ESRI ArcView Project files (*.apr), associated ESRI shapefiles and scanned boring logs compiled from several sources.   Each *. apr file displays borehole locations, information about the boring itself, and, where available, a scanned image of the boring log.  Be sure to read the "README.TXT" file before using this product.

%B Well Inventory %7 WI-05-01 %I Massachusetts Geological Survey %G eng %0 Online Database %D 2004 %T Well inventory of the Marlborough quadrangle, Massachusetts %A Duncan, C. %A Stephen B Mabee %K #MGSPub %K #Subsurface %K #WellInventory %K Ashland %K Berlin %K boring %K Hopkinton %K Hudson %K Malborough %K Marlborough %K Northborough %K Southborough %K subsurface %K Upton %K water resources %K wells %K Westborough %X

Well Inventories consist of ESRI ArcView Project files (*.apr), associated ESRI shapefiles and scanned boring logs compiled from several sources.   Each *. apr file displays borehole locations, information about the boring itself, and, where available, a scanned image of the boring log.  Be sure to read the "README.TXT" file before using this product.

%B Well Inventory %7 WI-04-01 %I Massachusetts Geological Survey %G eng %0 Map %D 2004 %T Bedrock geologic map of the Marlborough quadrangle, Massachusetts %A Joseph P Kopera %A DiNitto, R.G. %A Hepburn, J.C. %K #BedrockMaps %K #MGSPub %K alaskite %K amphibolite %K Andover Granite %K Ashland %K Berlin %K Bloody Bluff %K Burlington Mylonite Zone %K epidote %K fault zone %K gneiss %K granite %K granofels %K Hope Valley Alaskite %K Hopkinton %K Hudson %K Indian Head Hill %K Lake Char %K Malborough %K Milford granite %K Milham Reservoir %K mylonite %K Northborough %K quartzite %K schist %K shear zone %K Southborough %K volcanic %K Waltham Tectonic Melange %K Westborough %K Wolfpen Lens %B geologic Map %7 GM-06-01 %I Massachusetts Geological Survey %G eng %2

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%0 Map %D 2005 %T [Draft] Fracture characterization map of the Hudson quadrangle, Massachusetts %A Stephen B Mabee %K #FractureMaps %K #MGSPub %K Berlin %K Bolton %K Boxborough %K fault %K fracture %K fracture characterization %K fracture trace %K Harvard %K Hudson %K joint %K Malborough %K Stow %X

This preliminary version of the Fracture Characterization Map of the Hudson Quadrangle (Kopera, 2006) has been removed pending the future release of an updated version of the underlying bedrock geologic. The above version should be considered outdated. If you would like a copy of the outdated map, please contact Joseph Kopera at jkopera[at]geo[dot]geo[dot]umass[dot]edu

%B Open-File Report %I Massachusetts Geological Survey %G eng %2

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%0 Map %D 2004 %T [Draft] Surficial geology of the Marlborough quadrangle, Massachusetts %A Hildreth, C.T. %A Byron D Stone %K #MGSPub %K #SurficialMaps %K Ashland %K Berlin %K glacial %K Hopkinton %K Hudson %K Malborough %K Marlborough %K Northborough %K outwash %K Southborough %K stratified drift %K surficial %K Upton %K Westborough %B Open-File Report %I Massachusetts Geological Survey %G eng %1

GIS and metadata forthcoming

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%0 Map %D 2004 %T [Draft] Surficial materials map of the Marlborough quadrangle, Massachusetts %A Byron D Stone %A Hildreth C.T. %A Stephen B Mabee %K #MGSPub %K #Subsurface %K #SurficialMaps %K 3D %K Ashland %K Berlin %K glacial %K Hopkinton %K Hudson %K Malborough %K Northborough %K outwash %K Southborough %K stratified drift %K surficial %K till %K Westborough %X

This map shows the stacked vertical distribution of nonlithified surficial earth materials within the Marlborough quadrangle. This series of maps shows these deposits as they are vertically arranged in units from bottom to top. Surficial materials include mineral and rock particles in glacial deposits, and mineral, rock, and organic particles in postglacial deposits. Surficial materials also are known in engineering classifications as unconsolidated soils, which include coarse grained soils, fine grained soils, or organic fine grained soils. Surficial materials underlie and are the parent materials of modem pedogenic soils which have developed in them at the land surface. Delineation of the materials is based on surficial geologic mapping (Stone, 1978, Hildreth, 2003, 2004), the identification of glacial meltwater morphosequence deposits, knowledge of the deglaciation history of New England, and examination of borehole logs and water well records. For this set of maps, glacial meltwater deposits are distinguished by their geomorphologic expression, sediment type, and depositional environment. These deposits are further subdivided into a series of related glacial sedimentary facies, which are stacked vertically within each glaciaodeltaic or lake-bottom deposit. Postglacial deposits at the land surface are differentiated by their sediment type and geomorphic expression. The principal surficial materials map shows the distribution of these materials exposed at land surface. The smaller inset maps (maps A-F) show the surface and subsurface distribution of the glacial meltwater deposits , including the distribution of specific sedimentary facies that compose these meltwater deposits. By using each inset map in sequence both the lateral extent and vertical arrangement of the deposits at a particular location can be estimated from bottom to top.

%B Open-File Report %I Massachusetts Geological Survey %G eng %1

GIS Files and metadata forthcoming

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%0 Map %D 2006 %T Fracture characterization map of the Marlborough quadrangle, Massachusetts %A Stephen B Mabee %A Scott A Salamoff %K #FractureMaps %K #MGSPub %K Ashland %K Berlin %K fault %K fracture %K fracture trace %K groundwater %K Hopkinton %K Hudson %K hydrostructural domains %K joint %K lineament %K Malborough %K Northborough %K Southborough %K water resources %K Westborough %B Geologic Map %7 GM-06-02 v 2.1 %I Massachusetts Geological Survey %G eng %2

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%0 Map %D 2014 %T Preliminary Bedrock Geologic Map of the Hudson 7.5' Quadrangle Worcester and Middlesex Counties, Massachusetts %A Joseph P Kopera %A W.R. Hansen %K #BedrockMaps %K #MGSPub %K acton granite %K ayer granite %K Berlin %K Bolton %K Boxborough %K Clinton-Newbury Fault %K gneiss %K Harvard %K Harvard Conglomerate %K Hudson %K magnetite %K Malborough %K marble %K migmatite %K nashoba %K Stow %K tadmuck brook schist %K Vaughn Hills %X The Hudson quadrangle straddles the Clinton-Newbury Fault Zone (CNFZ), which separates low metamorphic grade Silurian turbiditic metasediments and Devonian plutons of the Nashua sub-belt (Robinson and Goldsmith, 1991) of the Merrimack Terrane to the northwest from the high-grade, migmatitic Cambro- Ordovician arc-complex of the Nashoba Terrane (Walsh et al., 2011; Loan 2011). This general area comprises the suture between the Gander and Avalon composite terranes of the Northern Appalachians (cf. Hibbard et al., 2006). Metasedimentary rocks of the Merrimack Terrane are generally poorly exposed, with intrusives (Day, Dayp, SDgdt) and the Clinton-Newbury Fault zone and associated rocks (Ot) forming a prominent northeast trending ridge (Oak Hill in the town of Harvard) marking the eastern bordering slope of the Worcester Plateau (Emerson, 1917, p. 16). Elevation and local topographic relief gradually decreases and glacial cover increases to the east-southeast across the strike of the Nashoba Formation, which, locally, forms low-relief NE-trending strike-parallel ridges. These are cut by dramatic cross-strike cliffs and glacial spillway gorges developed along cross-strike joints and brittle faults, most notably on the western slopes of Rattlesnake Hill, southern slope of Powder House Hill and in Camp Resolute in Bolton in the west-central portion of the quadrangle, and the southern slope of the hill along the west side of Codman Hill Road in Harvard in the north-central portion of the quadrangle. The migmatitic ortho- and paragneisses, schists and associated metavolcanic rocks of the Nashoba Formation (_Sn) form a northeast striking belt underlying the southern two-thirds of the quadrangle. These are intruded by a variety of presumed Ordovician to Silurian intermediate intrusives (OSd, OSaqd) and Devonian or younger tonalites to granites (Dan, Danp, Dac). %B Open File Report %7 14-01 %I Massachusetts Geological Survey %8 09/2014 %G eng %1 Note: This map supersedes "Preliminary bedrock geologic map of the Hudson quadrangle, Massachusetts", MGS map published in 2005 Report accompanies map-- be sure to download both! %0 Map %D 2005 %T Preliminary bedrock geologic map of the Hudson quadrangle, Massachusetts %A Joseph P Kopera %A Hansen, W.R. %K #BedrockMaps %K #MGSPub %K acton granite %K ayer granite %K Berlin %K Bolton %K Boxborough %K Clinton-Newbury Fault %K gneiss %K Harvard %K Harvard Conglomerate %K Hudson %K magnetite %K Malborough %K marble %K migmatite %K nashoba %K Stow %K tadmuck brook schist %K Vaughn Hills %X This map has been superseded by MGS OFR 14-01: Preliminary Bedrock Geologic Map of the Hudson 7.5' Quadrangle Worcester and Middlesex Counties, Massachusetts This map is an interim update to W.R. Hansen's 1956 Bedrock Geology of the Hudson and Maynard 7.5' quadrangles (USGS Bulletin 1038). This draft version of the Bedrock Map of the Hudson Quadrangle (Kopera, 2005) has been removed pending the future release of an updated version. The above version should be considered outdated. If you would like a copy of this map, please contact Joseph Kopera at jkopera[at]geo[dot]geo[dot]umass[dot]edu

%B Open-File Report %I Massachusetts Geological Survey %G eng %2

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%0 Map %D 0 %T Prototype three-dimensional surficial materials map of the Marlborough quadrangle, Massachusetts %A Steven A Nathan %A Stephen B Mabee %K #MGSPubs %K #SurficialMaps %K 3D %K Ashland %K Berlin %K glacial %K Hopkinton %K Hudson %K Malborough %K Northborough %K Southborough %K subsurface %K surface %K surficial %K Westborough %X

This map integrates well-drilling data with surficial geologic mapping and bedrock geology to produce a true three-dimensional model of the subsurface conditions within the Marlborough quadrangle, Massachusetts. The first component of this model is a map depicting a three-dimensional block diagram of the stratigraphic units that overlie the bedrock surface. The map also presents three-dimensional depictions of the individual stratigraphic units, their aerial extent and volumes.

In addition to the map, the supporting grid files, database and documentation for the three-dimensional model are provided.

This three-dimensional model of the subsurface stratigraphy of the Marlborough quadrangle provides a tool to visualize and explore the relationships of the subsurface units to one another, to the underlying bedrock, and to the water bearing fractures within the bedrock.

There are three immediate benefits of this three-dimensional model:

  1. it provides a better estimate of the volume of sand and gravel resources, surpassing current assessments it affords an estimate of the volume of water available in storage, making it a more complete measure of our water assets.
  2. it includes grid files of each stratigraphic unit, which provides a better initial conceptual model of the aquifer systems. The consulting community and water managers can import these grid files into groundwater modeling software for numerical analysis. In addition, the three-dimensional model can better delineate ground water flows, areas of groundwater recharge, and aquifer interconnectedness.
  3. It will also help identify possible contaminant pathways and assist in the placement of ground water monitoring wells. The model can also be used to assist with the planning of major construction projects, assess the impacts from development, provide guidance for land use planning and smart growth initiatives. In total, a three-dimensional model of the subsurface provides critical geologic information for natural resource decision making.
%B Open-File Report %I Massachusetts Geological Survey %8 2006 %G eng