变质砾岩

变质砾岩（英語：metaconglomerate）是礫岩經過變質作用后形成的岩石類型。礫岩是由卵石或較大的碎屑顆粒和基質組成，其基質為沙、淤泥或黏土。变质砾岩與礫岩組成相似，但其碎屑顆粒會經過變質而變形。礫岩的基質固結不如其碎屑顆粒，因此當破碎時，礫岩中的碎屑顆粒會從基質破裂而出。然而，变质砾岩破碎時其碎屑顆粒和基質會同時破裂，因其基質已經變質重結晶^[1]。

变质礫岩有時呈葉片狀，其生成變質環境與板岩或千枚岩相同，但母岩（原岩）是礫岩，而不是黏土^[2]。

西澳大利亞傑克山的變質礫岩是碎屑鋯石的源岩，這些碎屑鋯石的歷史可追溯至44億年^[3]^[4]。

參考文獻

^ Metaconglomerate
^ Essentials of Geology, 3rd Ed, Stephen Marshak
^ VALLEY, John W.1, CAVOSIE, A.J., WILDE, S.A., GRANT, M., and LIU, Dunyi, JACK HILLS METACONGLOMERATE: EVIDENCE OF EARLY AND LATE ARCHEAN HYDROSPHERE, The Geological Society of America, 2002 Denver Annual Meeting http://gsa.confex.com/gsa/2002AM/finalprogram/abstract_39602.htm
^ ftp://rock.geosociety.org/pub/reposit/2002/2002034.pdf from: Peck, W.H., Valley, J.W., Wilde, S.A., and Graham, C.M., 2001, Oxygen isotope ratios and rare earth elements in 3.3 to 4.4 ga zircons: Ion microprobe evidence for high δ18O continental crust in the early Archean: Geochimica et Cosmochimica Acta, v. 65, p. 4215-4229.

[”Meta”-1] Metaconglomerate

[”Esse”-2] Essentials of Geology, 3rd Ed, Stephen Marshak

[”VALLEY”-3] VALLEY, John W.1, CAVOSIE, A.J., WILDE, S.A., GRANT, M., and LIU, Dunyi, JACK HILLS METACONGLOMERATE: EVIDENCE OF EARLY AND LATE ARCHEAN HYDROSPHERE, The Geological Society of America, 2002 Denver Annual Meeting http://gsa.confex.com/gsa/2002AM/finalprogram/abstract_39602.htm

[”ftp:”-4] tp://rock.geosociety.org/pub/reposit/2002/2002034.pdf from: Peck, W.H., Valley, J.W., Wilde, S.A., and Graham, C.M., 2001, Oxygen isotope ratios and rare earth elements in 3.3 to 4.4 ga zircons: Ion microprobe evidence for high δ18O continental crust in the early Archean: Geochimica et Cosmochimica Acta, v. 65, p. 4215-4229.

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