Abstract The Coringa gold-silver (Cu–Pb–Zn) deposit, in southeastern Tapajos Mineral Province, is hosted in felsic volcanic rocks of the Vila Riozinho Formation and the Serra Alkali Feldspar Granite (hereafter Serra Granite). Field, petrographic, geochemical, and U–Pb, Lu–Hf, Sm–Nd data allowed us to constrain the magmatic evolution and tectonic setting of these units and surrounding volcano-plutonic sequences, with bearing in the tectonic evolution of the Tapajos Province, and the Amazonian Craton. The granites of the Creporizao Intrusive Suite (1956–2002 Ma) are high-K, calc-alkalic to alkali-calcic (subalkaline), metaluminous, and magnesian. The Serra Granite (1968–2020 Ma) is alkali-calcic and ferroan, with moderate to strongly negative eNd values (−8.0 to + 0.1), and model ages of 2.27–3.15 Ga, the same range of those presented by the intrusions of the Creporizao Suite, with Serra Granite being interpreted as a differentiated variety of the Creporizao Suite. Volcanic and pyroclastic rocks of the Vila Riozinho Formation (1996–2033 Ma) are high-K, calc-alkaline and magnesian, whereas the predominant “magnetic pyroclastic facies” of this formation is mostly ferroan alkalic (relatively reduced crystallization conditions). Despite the chemical difference, the magnetic pyroclastic facies, dated at 2024 to 1968 Ma, is similar in age to the “normal” Vila Riozinho Formation. The Nd–Hf isotopes reveal model ages between 2.38 and 2.42 Ga, and eHf and eNd values ranging from −2.1 to −3.2, which are very similar to those of the “normal” Vila Riozinho Formation (Sm–Nd TDM = 2.49–2.25 Ga, epsilon values of −3.71 to −1.03). The Maloquinha Intrusive Suite, which intruded older units, shows alkali-calcic to alkali and ferroan signature, along with trace-element distribution typical of silica saturated alkaline granites and was dated at 1883 ± 17 Ma. The geochemical and isotopic signature of the coeval Creporizao Suite and Vila Riozinho Formation indicate that they belong to the same Orosirian magmatic event. Considering the age relationships with precedent magmatic events in the Tapajos Mineral Province, attributed to arc setting, we interpret this event as post-collisional, with the collision assemblages occurring outside the Tapajos Province, in the Guiana Shield, as part of a large Orosirian orogenic belt. The Maloquinha Suite is associated with the Uatuma silicious large igneous province (∼1.89–1.86 Ga), which was established in a craton-wide extensional event that followed the Orosirian orogeny.

中文翻译：

---

巴西亚马逊克拉通 Tapajós 矿区岩浆-热液 coringa 金-银 (Cu-Pb-Zn) 矿床的地球化学和同位素约束

摘要 Coringa 金银 (Cu-Pb-Zn) 矿床位于 Tapajos 矿产省东南部，位于 Vila Riozinho 组和 Serra 碱性长石花岗岩（以下简称 Serra Granite）的长英质火山岩中。场、岩相、地球化学和 U-Pb、Lu-Hf、Sm-Nd 数据使我们能够限制这些单元的岩浆演化和构造环境以及周围的火山-深成岩序列，并在塔帕霍斯省的构造演化中产生影响，和亚马逊克拉通。Creporizao Intrusive Suite (1956–2002 Ma) 的花岗岩为高钾、钙碱性至碱钙（亚碱性）、金属铝和镁质花岗岩。塞拉花岗岩（1968-2020 Ma）是碱性钙质和铁质，具有中等至强负的 eNd 值（-8.0 至 + 0.1），模型年龄为 2.27-3.15 Ga，与 Creporizao Suite 的入侵所呈现的范围相同，Serra Granite 被解释为 Creporizao Suite 的差异化变种。Vila Riozinho 组（1996-2033 Ma）的火山和火山碎屑岩是高钾、钙碱性和镁质岩，而该地层的主要“磁性火山碎屑相”主要是铁碱性（结晶条件相对降低）。尽管存在化学差异，但年代为 2024 年至 1968 年 Ma 的磁性火山碎屑岩相在年龄上与“正常”Vila Riozinho 组相似。Nd-Hf 同位素显示模型年龄介于 2.38 和 2.42 Ga 之间，eHf 和 eNd 值范围从 -2.1 到 -3.2，这与“正常”Vila Riozinho 地层（Sm-Nd TDM = 2.49-2.25 Ga，ε 值为 -3.71 至 -1.03）。Maloquinha Intrusive Suite 侵入了较旧的单元，显示出碱钙到碱和铁的特征，以及典型的二氧化硅饱和碱性花岗岩的微量元素分布，其年代为 1883 ± 17 Ma。同期 Creporizao Suite 和 Vila Riozinho 组的地球化学和同位素特征表明它们属于同一奥罗西纪岩浆事件。考虑到与塔帕霍斯矿产省先前岩浆事件的年龄关系，归因于弧设置，我们将此事件解释为后碰撞，碰撞组合发生在塔帕霍斯省以外的圭亚那地盾，作为大型奥罗斯纪造山带的一部分腰带。Maloquinha Suite 与 Uatuma 硅质大型火成岩省（~1.89-1.86 Ga）有关，