Reply to Comment on "Corundum-bearing garnet peridotites from northern Dominican Republic: A metamorphic product of an arc cumulate in the Caribbean subduction zone" by Richard N. Abbott and Grenville Draper Kéiko H. Hattori a, ⁎, Stéphane Guillot b , Mike N. Tubrett c , Benoit-Michel Saumur a , Olivier Vidal b , Samuel Morfin b a Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5 b Laboratoire de Geodynamique des Chaînes Alpines, Centre National de la Recherche Scientifique, University of Grenoble, 1381 rue de la Piscine, 38041, France c Inco Innovation Centre, Memorial University of Newfoundland, St John's, Newfoundland, Canada A1C 5S7 abstract article info Article history: Received 2 March 2010 Accepted 4 March 2010 Available online 12 March 2010 Keywords: Garnet peridotite Arc cumulates Subduction channel Serpentinite Corundum Ultra-high pressure metamorphism Caribbean arc In our Reply to the Comment by Abbott R.N., Jr., Draper, G., 2010. Comment on “Corundum-bearing garnet peridotite from northern Dominican Republic: A metamorphic product of an arc cumulate in the Caribbean subduction zone” by Hattori et al. Lithos 114 (2010) 437–450]. Lithos 117, 322–326 (this issue), we clarify several points concerning the origin of garnet (Grt)-bearing ultramafic rocks in Dominican Republic, and provide new trace element data from additional samples that contain varying amounts of loss on ignition (LOI). These new data verify that the trace element signature of these bulk rocks reflect those of their primary rocks, and are not significantly affected by low-temperature alteration. These new geochemical data reconfirm the interpretations in our paper (Hattori et al., 2010a) that Grt-bearing ultramafic rocks crystallized as cumulates of arc magmas at shallow levels in the mantle wedge, and were later metamorphosed in the subduction channel to form Grt. © 2010 Elsevier B.V. All rights reserved. 1. Introduction We welcome this opportunity to highlight the interpretations in our paper (Hattori et al., 2010a), make some clarifications, and offer further discussion and new data in light of the Comment by Abbott and Draper (2010-this issue). Abbott et al. published two papers in International Geology Review (Abbott et al., 2005, 2007), in which they suggested that garnet (Grt)-bearing ultramafic rocks in northern Dominican Republic crystallized from a melt at high temperatures and pressures (N 1500 °C, N 3.2 GPa). In our recent paper in this journal (Hattori et al., 2010a), we proposed that these rocks crystallized as cumulates of arc magmas under low pressures in the mantle wedge, and were later metamorphosed in the subduction channel to form Grt, based on the mineral assemblage, mineral chemistry, and trace element data of clinopyroxene (Cpx). The points that Abbott and Draper (2010-this issue) raise in their lengthy Comment can be summarized, with our replies, as follows. 2. Replies 2.1. Eu anomalies (Section 2 in Abbot and Draper's Comment) Abbott and Draper (2010-this issue) suggest that the observed positive Eu anomalies in Grt peridotites are due to incorporation of REE from surrounding eclogites during late hydration. They also suggest that high contents of Pb and Sr in these rocks support the late hydration of our samples. As we described in our paper (p. 444, Hattori et al., 2010a), the enrichment of fluid-mobile elements, such as Pb and Sr, is an intrinsic character of subduction-related magmas, as documented in many arc rocks (e.g., Hofmann, 1988; Hawkesworth et al., 1993). High concentrations of Sr and Pb in igneous rocks, there- fore, do not necessarily require that they were altered at low temperatures. To verify our interpretations, we obtained trace element data of samples that contain variable amounts of H 2 O. If the statement by Abbott and Draper (2010-this issue) is correct, we should expect high concentrations of fluid-mobile elements in rocks with high H 2 O. Trace element patterns (Fig. 1, this Reply) are remarkably similar among samples that have different losses on ignition (LOI). In addition, high concentrations of fluid-mobile elements, U, Pb and Sr, are found in sample RD 62 (Figs. 1 and 2, this Reply), which has high modal Lithos 117 (2010) 327–330 DOI of original article: 10.1016/j.lithos.2009.10.010. DOI of Comment: 10.1016/j.lithos.2010.30.011. ⁎ Corresponding author. E-mail address: keikohhattori@yahoo.com (K.H. Hattori). Contents lists available at ScienceDirect Lithos journal homepage: www.elsevier.com/locate/lithos 0024-4937/$ – see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.lithos.2010.03.007