(NH) Plutonic Magma Series -- Southwestern New Hampshire

Title

(NH) Plutonic Magma Series -- Southwestern New Hampshire

Description

A sampling of the four plutonic stages of the New Hampshire series. This encompasses the Bethlehem Gneiss, the Kinsman Quartz Monzonite, the Spaulding Quartz Diorite and the Concord Granite. The rocks cover the Mascoma, Sunapee, Mt. Kearsarge, Penacook, Hillsboro, and Concord Quadrangles. The ages of the series range from 359-411 Ma.

Date

August 1979

Contributor

Western Minerals Inc.

Spatial Coverage

Southwestern New Hampshire: Mascoma, Sunapee, Mt. Kearsarge, Penacook, Hillsboro, and Concord Quadrangles

Temporal Coverage

359-411 Ma

Accrual Method

Purchased from Western Minerals Inc.

References

Start here:
Dorais, M.J., 2003, The petrogenesis and emplacement of the New Hampshire Plutonic Suite: American Journal of Science, v. 303, pp. 447-487, 
  • This paper describes the formation of each of the four series in the New Hampshire magma series.

Additional Resources:
Clark, R.G., and Lyons, J.B., 1986, Petrogenesis of the Kinsman intrusive suite; peraluminous granitiods of western New Hampshire: Journal of Petrology, v. 27, pp. 1365-1393
  • This paper describes the formation of the Kinsman Quartz Monzonite in detail.

Duke, E.F., 1978, Petrology of Spaulding Group tonalites from Penacook Quadrangle, New Hampshire [Ph.D. Thesis], Dartmouth College, 117 p. 
  • This thesis details the emplacement, formation, and petrology of the Spaulding Quartz Diorite.
Lathrop, A.S., Blum, J.D., and Chamberlain, C.P., 1996, Nd, Sr and O isotopic study of the petrogeneseis of two syntectonic members of the New Hampshire plutonic series: Contributions to Mineralogy and Petrology, v. 124, pp. 126-138.
  • This paper describes the elemental and isotopic analyses of the New Hampshire magma series in order to better understand the petrogenesis of the suite.
Lyons, J.B., and Livingston, D.E., 1977, Rb-Sr age of the New Hampshire Plutonic Series: Geological Society of America Bulletin, v. 88, pp. 1808-1812
  • This paper uses Rb-Sr isotopic analyses in order to age date the four different members of the New Hampshire magma series.

Items in the (NH) Plutonic Magma Series -- Southwestern New Hampshire Collection

OCR PDF of supplemental information for the Plutonic Magma Series- Southwestern New Hampshire collection.

Gneiss
Gneiss from the Bethlehem Gneiss series. Thin section contains biotite, plagioclase, alkali feldspar, and quartz. Hand sample shows slight discoloration (orange tinge) from weathering of an iron oxide, a high concentration of biotite, quartz, and…

Gneiss
Gneiss from the Bethlehem Gneiss series. Thin section contains plagioclase, alkali feldspar, biotite, quartz, and muscovite. Hand sample contains feldspars, quartz, and micas.

Gneiss
Gneiss from the Bethlehem Gneiss series. Coarser grained. Thin section contains biotite, muscovite, quartz, plagioclase, and alkali feldspar. Hand sample is coarser than NH-3 and contains quartz, feldspars, and micas. From the same locality as NH-4.

Gneiss
Gneiss from the Bethlehem Gneiss series. Thin section contains biotite, muscovite, quartz, and plagioclase. Hand sample is finer grained than NH-3 and contains feldspars, quartz, and micas. From the same locality as NH-3.

Granite
Granite from the Concord Granite series. Thin section contains plagioclase, alkali feldspar, biotite, quartz, and muscovite. Hand sample shows feldspars, quartz, and micas.

Gneiss
Gneiss from the Bethlehem Gneiss series. Thin section contains quartz, biotite, plagioclase, and muscovite. Hand sample is a leucocratic facies and contains quartz, feldspars, and micas.

Garnet Gneiss
Garnet Gneiss from the Kinsman Quartz Monzonite. Thin section contains large alkali feldspar porphyroblasts, plagioclase, biotite, muscovite, garnet, and quartz. Hand sample is coarse grained and cataclastic, and contains plagioclase, bitote,…

Quartz Monzonite
Leucocratic facies of the Kinsman Quartz Monzonite. Thin section contains plagioclase, bitote, quartz, alkali feldspar, and muscovite. Hand sample shows feldspars, quartz, and biotite. Taken from the same location as NH-7.

Quartz Monzonite
Quartz Monzonite from the Kinsman Quartz Monzonite series. The garnets show definite zoning, with some zones up to 1.0mm thick. Thin section is garnet rich and also contains plagioclase, quartz, alkali feldspar, some biotite, and muscovite. Hand…

Sillimanite Granite
Granite from the Spaulding Quartz Diorite. Thin section contains plagioclase, biotite, quartz, alkali feldspar, some garnet, and sillimanite. Hand sample shows quartz, feldspars, sillimanite, and mica.

Hypersthene Quartz Diorite
Hypersthene Quartz Diorite from the Spaulding Quartz Diorite. Thin section contains pyroxene, quartz, biotite, plagioclase, and alkali feldspar. Hand sample shows micas, quartz, feldspars, and pyroxene.

Spotted Spaulding Granite
Spotted Spaulding Granite, member of the Spaulding Quartz Diorite. Part of an irregular sill, not the major facies. Spotted appearance, extends through more mafic facies. Thin section contains quartz, alkali feldspar, plagioclase, mica, and…

Ferrohypersthene Garnet Biotite Tonalite
Ferrohypersthene Garnet Biotite Tonalite from the Spaulding Quartz Diorite. Some samples are fairly weathered. Thin section contains garnet, biotite, quartz, and plagioclase. Hand sample shows garnet, biotite, quartz, feldspars, and evidence of…

Aplite
From the Concord Granite. Thin section contains plagioclase, potassium feldspar, quartz, biotite, and muscovite. Hand sample is finer grained and contains feldspars, quartz, and micas.

Muscovite Granite
Coarse grained sample from the Concord Granite. Thin section contains plagioclase, potassium feldspar, quartz, and muscovite. Hand sample is a coarse granite with quartz, feldspars, and muscovite.

Two-mica Granite
Relatively coarse facies from the Concord Granite. Thin section contains plagioclase, potassium feldspar, quartz, muscovite, and biotite. Hand sample is a coarse-grained granite with quartz, feldspars, and micas.

Quartz Monzonite
Quartz Monzonite from the Kinsman Quartz Monzonite unit. Thin section contains lots of plagioclase in addition to biotite and quartz. Hand sample contains feldspars, quartz, and biotite.

Quartz Monzonite
Quartz Monzonite from the Kinsman Quartz Monzonite unit. Thin section shows quartz, potassium feldspar, plagioclase, biotite, muscovite, and myrmekitic texture. Hand sample contains quartz, feldspars, and micas.

Concord Granite
Granite, dark facies, from the Concord Granite. Thin section contains quartz, plagioclase, potassium feldspar, and biotite. Hand sample shows lots of quartz and feldspars with dark biotite.

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