UNVEILING A MYSTERIOUS NEARBY COOL-CORE CLUSTER LACKING A CENTRAL BCG THE NEARBY CLUSTER ABELL 1142 IS EXPERIENCING AN OFF-AXIS MERGER BETWEEN TWO SUBCLUSTERS OF ROUGHLY EQUAL MASSES. EACH SUBCLUSTER CONTAINS A BRIGHTEST CLUSTER GALAXY (BCG). ABELL 1142 APPEARS TO HARBOR A COOL CORE WITH A METAL ABUNDANCE GRADIENT DECLINING OUTWARD. THIS COOL CORE IS OFFSET FROM EACH BCG BY ~100 KPC. WE PROPOSE A MODERATELY DEEP XMM OBSERVATION OF THIS UNIQUE OBJECT TO OBTAIN ITS DETAILED METAL DISTRIBUTIONS IN THE CENTRAL REGION AND PROBE ITS GLOBAL GAS PROPERTIES OUT TO 0.5 R500. THE REQUESTED OBSERVATION WILL ENABLE US TO (1) STUDY THE ENRICHMENT PROCESSES OF CLUSTER CENTERS (TO DISTINGUISH BETWEEN THE BCG AND THE SUB-GROUP INFALL ORIGINS) AND (2) UNDERSTAND THE ROLE OF MERGERS IN THE FORMATION AND DESTRUCTION OF CLUSTER COOL CORES.