{'fraction_non_alphanumeric': 0.05017182130584193, 'fraction_numerical': 0.003436426116838488, 'mean_word_length': 5.385964912280702, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Geochemical characteristics of iron ore deposits in central eastern Turkey: an approach to their genesis

ABSTRACT Economically the most important iron deposits of Turkey occur as: (1) skarn-hosted (SH)-type ore deposits, occurring along the contacts between syenitic-monzonitic intrusives and limestone or serpentine; (2) vein-type deposits, found between the serpentine and limestone (SLH); or (3) ore deposits that are entirely within the limestone (LH). Elemental associations are defined as: Fe+Ni+Cr+U+Bi+Rb+Mg+Ga for the SH-type ores; Fe+Cr+Mn+Nb+V for the SLH-type ores; and Fe+Ag+Au+Cr+Ba+As+Pb+Sb+Ni for the LH-type ores. Positive correlations between Fe, U, Bi, and Rb for the SH type indicate that late magmatic hydrothermal input was related to monzonitic intrusions. Chondrite-normalized rare earth element (REE) patterns of the 14 deposits show very weak light/heavy REE (LREE/HREE) fractionation. Similarities of REE patterns, particularly between the SH and LH types, may indicate a common source of REEs and Fe. Ce depletion in the LH ores indicates long-term fluid flow and interaction with marine sediments. Ni, Cr, and V enrichment of all deposits indicates that iron was scavenged from the serpentinized ultra-basic-basic rocks and transported along fracture zones by hydrothermal solutions driven by intrusions. The iron deposits were formed around the magmatic bodies, or tectonic contacts between the serpentine and the limestone.