gabbroidadj.n.

Brit.

/ˈɡabrɔɪd/, U.S.

/ˈɡæˌbrɔɪd/

Origin: Formed within English, by derivation. Etymons: gabbro n., -oid suffix.

Etymology: < gabbro n. + -oid suffix.

Geology.

A. adj.

Of the nature of or resembling gabbro.

ΚΠ

1898 Proc. 5th Ann. Meeting Lake Superior Mining Inst. 56 Redwood county is the site of the Delhi mine, which was opened in 1893 or near that date, in Archæan gneissic and gabbroid rocks carrying quartz veins and segregations.

1908 Amer. Jrnl. Sci. 176 45 In a fully represented petrogenic cycle at a batholithic area..the oldest intrusion should be a rock of gabbroid (basaltic) composition.

1972 S. H. Mehdi et al. in A. G. Jhingran et al. Himalayan Geol. II. 499 It is difficult to say whether these ‘outliers’..are the result of metamorphism due to granitic or gabbroid igneous bodies.

2009 Jrnl. Geol. (Chicago) 117 142/2 The first flow ranges in thickness from 127 to 157 m and contains thick, discontinuous, coarse-grained gabbroid layers.

B. n.

A gabbroid rock.

ΚΠ

1904 T. C. Chamberlin & R. D. Salisbury Geol. I. vii. 432 The term gabbroids may be used to include the dark crystalline rocks in which the ferromagnesian minerals predominate, as the diorites, gabbros, dolerites, peridotites, etc.

1978 Jrnl. Geol. (Chicago) 86 167/2 Diabase-spilites, gabbros and serpentinized hyperbasites are present in the Malyy Anyuy River basin while andesite-basalts and gabbroids are present farther north.

2013 J. Saleeby et al. in K. Putirka Geologic Excursions Fresno, Calif., & Central Valley iii. 43/2 Mafic granitoids and gabbroids are concentrated to the west.

Derivatives

gaˈbbroidal adj. now rare of the nature of, resembling, or characteristic of gabbro.

ΚΠ

1901 Summary Rep. Geol. Surv. Canada 1900 (Sessional Paper No. 26) 76 The gabbroidal rock, as well as the ordinary greenstone, is mineralized.

1931 Mineral. Abstr. 4 401 Chemical analyses of the differentiation products of a gabbroidal magma, viz. diorite-pegmatite, diorite-aplite [etc.].

1965 G. J. Williams Econ. Geol. N.Z. x. 160/2 These lenses..were invaded by gabbroidal and peridotitic dykes conformably with the bedding planes.

This entry has been updated (OED Third Edition, June 2018; most recently modified version published online March 2022).

单词	gabbroid
释义	gabbroidadj.n. Brit. /ˈɡabrɔɪd/, U.S. /ˈɡæˌbrɔɪd/ Origin: Formed within English, by derivation. Etymons: gabbro n., -oid suffix. Etymology: < gabbro n. + -oid suffix. Geology. A. adj. Of the nature of or resembling gabbro. ΚΠ 1898 Proc. 5th Ann. Meeting Lake Superior Mining Inst. 56 Redwood county is the site of the Delhi mine, which was opened in 1893 or near that date, in Archæan gneissic and gabbroid rocks carrying quartz veins and segregations. 1908 Amer. Jrnl. Sci. 176 45 In a fully represented petrogenic cycle at a batholithic area..the oldest intrusion should be a rock of gabbroid (basaltic) composition. 1972 S. H. Mehdi et al. in A. G. Jhingran et al. Himalayan Geol. II. 499 It is difficult to say whether these ‘outliers’..are the result of metamorphism due to granitic or gabbroid igneous bodies. 2009 Jrnl. Geol. (Chicago) 117 142/2 The first flow ranges in thickness from 127 to 157 m and contains thick, discontinuous, coarse-grained gabbroid layers. B. n. A gabbroid rock. ΚΠ 1904 T. C. Chamberlin & R. D. Salisbury Geol. I. vii. 432 The term gabbroids may be used to include the dark crystalline rocks in which the ferromagnesian minerals predominate, as the diorites, gabbros, dolerites, peridotites, etc. 1978 Jrnl. Geol. (Chicago) 86 167/2 Diabase-spilites, gabbros and serpentinized hyperbasites are present in the Malyy Anyuy River basin while andesite-basalts and gabbroids are present farther north. 2013 J. Saleeby et al. in K. Putirka Geologic Excursions Fresno, Calif., & Central Valley iii. 43/2 Mafic granitoids and gabbroids are concentrated to the west. Derivatives gaˈbbroidal adj. now rare of the nature of, resembling, or characteristic of gabbro. ΚΠ 1901 Summary Rep. Geol. Surv. Canada 1900 (Sessional Paper No. 26) 76 The gabbroidal rock, as well as the ordinary greenstone, is mineralized. 1931 Mineral. Abstr. 4 401 Chemical analyses of the differentiation products of a gabbroidal magma, viz. diorite-pegmatite, diorite-aplite [etc.]. 1965 G. J. Williams Econ. Geol. N.Z. x. 160/2 These lenses..were invaded by gabbroidal and peridotitic dykes conformably with the bedding planes. This entry has been updated (OED Third Edition, June 2018; most recently modified version published online March 2022). < adj.n.1898
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